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Features
* Compatible with MCSTM-51 Products * 12K Bytes of In-System Programmable (ISP) Flash Program Memory
- SPI Serial Interface for Program Downloading - Endurance: 10,000 Write/Erase Cycles 2K Bytes EEPROM Data Memory - Endurance: 100,000 Write/Erase Cycles 64-byte User Signature Array 2.7V to 5.5V Operating Range Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Nine Interrupt Sources Enhanced UART Serial Port with Framing Error Detection and Automatic Address Recognition Enhanced SPI (Double Write/Read Buffered) Serial Interface Low-power Idle and Power-down Modes Interrupt Recovery from Power-down Mode Programmable Watchdog Timer Dual Data Pointer Power-off Flag Flexible ISP Programming (Byte and Page Modes) - Page Mode: 64 Bytes/Page for Code Memory, 32 Bytes/Page for Data Memory Four-level Enhanced Interrupt Controller Programmable and Fuseable x2 Clock Option Internal Power-on Reset 42-pin PDIP Package Option for Reduced EMC Emission Green (Pb/Halide-free) Packaging Option
* * * * * * * * * * * * * * * * * * * * * *
8-bit Microcontroller with 12K Bytes Flash and 2K Bytes EEPROM AT89S8253 Preliminary
1. Description
The AT89S8253 is a low-power, high-performance CMOS 8-bit microcontroller with 12K bytes of In-System Programmable (ISP) Flash program memory and 2K bytes of EEPROM data memory. The device is manufactured using Atmel's high-density nonvolatile memory technology and is compatible with the industry-standard MCS-51 instruction set and pinout. The on-chip downloadable Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8253 is a powerful microcontroller which provides a highly-flexible and cost-effective solution to many embedded control applications.
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The AT89S8253 provides the following standard features: 12K bytes of In-System Programmable Flash, 2K bytes of EEPROM, 256 bytes of RAM, 32 I/O lines, programmable watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector, four-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S8253 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes. The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port, and interrupt system to continue functioning. The Power-down mode saves the RAM contents but freezes the oscillator, disabling all other chip functions until the next external interrupt or hardware reset. The on-board Flash/EEPROM is accessible through the SPI serial interface. Holding RESET active forces the SPI bus into a serial programming interface and allows the program memory to be written to or read from, unless one or more lock bits have been activated.
2. Pin Configurations
2.1 40P6 - 40-lead PDIP
(T2) P1.0 (T2 EX) P1.1 P1.2 P1.3 (SS) P1.4 (MOSI) P1.5 (MISO) P1.6 (SCK) P1.7 RST (RXD) P3.0 (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5 (WR) P3.6 (RD) P3.7 XTAL2 XTAL1 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 VCC P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13) P2.4 (A12) P2.3 (A11) P2.2 (A10) P2.1 (A9) P2.0 (A8)
2.2
44A - 44-lead TQFP
P1.4 (SS) P1.3 P1.2 P1.1 (T2 EX) P1.0 (T2) NC VCC P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) 44 43 42 41 40 39 38 37 36 35 34
33 32 31 30 29 28 27 26 25 24 23
(MOSI) P1.5 (MISO) P1.6 (SCK) P1.7 RST (RXD) P3.0 NC (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5
1 2 3 4 5 6 7 8 9 10 11
P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP NC ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13)
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(WR) P3.6 (RD) P3.7 XTAL2 XTAL1 GND GND (A8) P2.0 (A9) P2.1 (A10) P2.2 (A11) P2.3 (A12) P2.4
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2.3 44J - 44-lead PLCC
P1.4 (SS) P1.3 P1.2 P1.1 (T2 EX) P1.0 (T2) NC VCC P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3)
2.4
42PS6 - PDIP
RST (RXD) P3.0 (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5 (WR) P3.6 (RD) P3.7 XTAL2 XTAL1 GND PWRGND (A8) P2.0 (A9) P2.1 (A10) P2.2 (A11) P2.3 (A12) P2.4 (A13) P2.5 (A14) P2.6 (A15) P2.7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 P1.7 (SCK) P1.6 (MISO) P1.5 (MOSI) P1.4 (SS) P1.3 P1.2 P1.1 (T2EX) P1.0 (T2) VDD PWRVDD P0.0 (AD0) P0.1 (AD1) P0.2 (AD2) P0.3 (AD3) P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP ALE/PROG PSEN
3. Pin Description
3.1 VCC
Supply voltage (all packages except 42-PDIP).
3.2
GND
Ground (all packages except 42-PDIP; for 42-PDIP GND connects only the logic core and the embedded program/data memories).
3.3
VDD
Supply voltage for the 42-PDIP which connects only the logic core and the embedded program/data memories.
(WR) P3.6 (RD) P3.7 XTAL2 XTAL1 GND NC (A8) P2.0 (A9) P2.1 (A10) P2.2 (A11) P2.3 (A12) P2.4
18 19 20 21 22 23 24 25 26 27 28
(MOSI) P1.5 (MISO) P1.6 (SCK) P1.7 RST (RXD) P3.0 NC (TXD) P3.1 (INT0) P3.2 (INT1) P3.3 (T0) P3.4 (T1) P3.5
6 5 4 3 2 1 44 43 42 41 40
7 8 9 10 11 12 13 14 15 16 17
39 38 37 36 35 34 33 32 31 30 29
P0.4 (AD4) P0.5 (AD5) P0.6 (AD6) P0.7 (AD7) EA/VPP NC ALE/PROG PSEN P2.7 (A15) P2.6 (A14) P2.5 (A13)
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3.4
PWRVDD
Supply voltage for the 42-PDIP which connects only the I/O Pad Drivers. The application board must connect both VDD and PWRVDD to the board supply voltage.
3.5
PWRGND
Ground for the 42-PDIP which connects only the I/O Pad Drivers. PWRGND and GND are weakly connected through the common silicon substrate, but not through any metal links. The application board must connect both GND and PWRGND to the board ground.
3.6
Port 0
Port 0 is an 8-bit open drain bi-directional I/O port. As an output port, each pin can sink six TTL inputs. When 1s are written to port 0 pins, the pins can be used as high-impedance inputs. Port 0 can also be configured to be the multiplexed low-order address/data bus during accesses to external program and data memory. In this mode, P0 has internal pull-ups. Port 0 also receives the code bytes during Flash programming and outputs the code bytes during program verification. External pull-ups are required during program verification.
3.7
Port 1
Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 1 output buffers can sink/source six TTL inputs. When 1s are written to Port 1 pins, they are pulled high by the weak internal pull-ups and can be used as inputs. As inputs, Port 1 pins that are externally being pulled low will source current (IIL,150 A typical) because of the weak internal pull-ups. Some Port 1 pins provide additional functions. P1.0 and P1.1 can be configured to be the timer/counter 2 external count input (P1.0/T2) and the timer/counter 2 trigger input (P1.1/T2EX), respectively. Furthermore, P1.4, P1.5, P1.6, and P1.7 can be configured as the SPI slave port select, data input/output and shift clock input/output pins as shown in the following table.
Port Pin P1.0 P1.1 P1.4 P1.5 P1.6 P1.7 Alternate Functions T2 (external count input to Timer/Counter 2), clock-out T2EX (Timer/Counter 2 capture/reload trigger and direction control) SS (Slave port select input) MOSI (Master data output, slave data input pin for SPI channel) MISO (Master data input, slave data output pin for SPI channel) SCK (Master clock output, slave clock input pin for SPI channel)
Port 1 also receives the low-order address bytes during Flash programming and verification.
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3.8 Port 2
Port 2 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 2 output buffers can sink/source six TTL inputs. When 1s are written to Port 2 pins, they are pulled high by the weak internal pull-ups and can be used as inputs. As inputs, Port 2 pins that are externally being pulled low will source current (IIL,150 A typical) because of the weak internal pull-ups. Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @ DPTR). In this application, Port 2 uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOVX @ RI), Port 2 emits the contents of the P2 Special Function Register. Port 2 also receives the high-order address bits and some control signals during Flash programming and verification.
3.9
Port 3
Port 3 is an 8-bit bi-directional I/O port with internal pull-ups. The Port 3 output buffers can sink/source six TTL inputs. When 1s are written to Port 3 pins, they are pulled high by the weak internal pull-ups and can be used as inputs. As inputs, Port 3 pins that are externally being pulled low will source current (IIL,150 A typical) because of the weak internal pull-ups. Port 3 receives some control signals for Flash programming and verification. Port 3 also serves the functions of various special features of the AT89S8253, as shown in the following table.
Port Pin P3.0 P3.1 P3.2 P3.3 P3.4 P3.5 P3.6 P3.7 Note: Alternate Functions RXD (serial input port) TXD (serial output port) INT0 (external interrupt 0)(1) INT1 (external interrupt 1)(1) T0 (timer 0 external input) T1 (timer 1 external input) WR (external data memory write strobe) RD (external data memory read strobe) 1. All pins in ports 1 and 2 and almost all pins in port 3 (the exceptions are P3.2 INT0 and P3.3 INT1) have their weak internal pull-ups disabled in the Power-down mode. Port pins P3.2 (INT0) and P3.1 (INT1) are active even in Power-down mode (to be able to sense an interrupt request to exit the Power-down mode) and as such still have their weak internal pullups turned on.
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3.10
RST
Reset input. A high on this pin for at least two machine cycles while the oscillator is running resets the device.
3.11
ALE/PROG
Address Latch Enable. ALE/PROG is an output pulse for latching the low byte of the address (on its falling edge) during accesses to external memory. This pin is also the program pulse input (PROG) during Flash programming. In normal operation, ALE is emitted at a constant rate of 1/6 the oscillator frequency and may be used for external timing or clocking purposes. Note, however, that one ALE pulse is skipped during each access to external data memory. If desired, ALE operation can be disabled by setting bit 0 of the AUXR SFR at location 8EH. With the bit set, ALE is active only during a MOVX or MOVC instruction. Otherwise, the pin is weakly pulled high. Setting the ALE-disable bit has no effect if the microcontroller is in external execution mode.
3.12
PSEN
Program Store Enable. PSEN is the read strobe to external program memory (active low). When the AT89S8253 is executing code from external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory.
3.13
EA/VPP
External Access Enable. EA must be strapped to GND in order to enable the device to fetch code from external program memory locations starting at 0000H up to FFFFH. Note, however, that if lock bit 1 is programmed, EA will be internally latched on reset. EA should be strapped to VCC for internal program executions. This pin also receives the 12-volt programming enable voltage (V PP) during Flash programming when 12-volt programming is selected.
3.14
XTAL1
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
3.15
XTAL2
Output from the inverting oscillator amplifier.
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4. Block Diagram
P0.0 - P0.7 P2.0 - P2.7
VCC PORT 0 DRIVERS GND PORT 2 DRIVERS
EEPROM
RAM ADDR. REGISTER
RAM
PORT 0 LATCH
PORT 2 LATCH
FLASH
B REGISTER
ACC
STACK POINTER
PROGRAM ADDRESS REGISTER
BUFFER TMP2 TMP1
ALU INTERRUPT, SERIAL PORT, AND TIMER BLOCKS
PC INCREMENTER
PSW
PROGRAM COUNTER
PSEN ALE/PROG EA / VPP RST WATCH DOG PORT 3 LATCH TIMING AND CONTROL INSTRUCTION REGISTER DUAL DPTR
PORT 1 LATCH
SPI PORT
PROGRAM LOGIC
OSC PORT 3 DRIVERS PORT 1 DRIVERS
P3.0 - P3.7
P1.0 - P1.7
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5. Special Function Registers
A map of the on-chip memory area called the Special Function Register (SFR) space is shown in Table 5-1. Note that not all of the addresses are occupied, and unoccupied addresses may not be implemented on the chip. Read accesses to these addresses will generally return random data, and write accesses will have an indeterminate effect. User software should not write 1s to these unlisted locations, since they may be used in future products to invoke new features. In that case, the reset or inactive values of the new bits will always be 0.
Table 5-1.
0F8H 0F0H 0E8H 0E0H 0D8H 0D0H 0C8H 0C0H 0B8H
AT89S8253 SFR Map and Reset Values
0FFH B 00000000 0F7H 0EFH ACC 00000000 0E7H 0DFH PSW 00000000 T2CON 00000000 T2MOD XXXXXX00 RCAP2L 00000000 RCAP2H 00000000 TL2 00000000 SPCR 00000100 TH2 00000000 0D7H 0CFH 0C7H IP XX000000 P3 11111111 IE 0X000000 P2 11111111 SCON 00000000 P1 11111111 TCON 00000000 P0 11111111 TMOD 00000000 SP 00000111 TL0 00000000 DP0L 00000000 TL1 00000000 DP0H 00000000 TH0 00000000 DP1L 00000000 TH1 00000000 DP1H 00000000 SBUF XXXXXXXX EECON XX000011 AUXR XXXXXXX0 SPDR ######## CLKREG XXXXXXX0 PCON 0XXX0000 SADDR 00000000 SPSR 000XXX00 WDTRST (Write Only) WDTCON 0000 0000 SADEN 00000000 IPH XX000000 0BFH
0B0H
0B7H
0A8H
0AFH
0A0H 98H 90H 88H 80H
0A7H 9FH 97H 8FH 87H
Note:
# means: 0 after cold reset and unchanged after warm reset.
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5.1 Auxiliary Register
AUXR - Auxiliary Register
Reset Value = XXXX XXX0B
The AUXR Register contains a single active bit called DISALE. Table 5-2.
AUXR Address = 8EH Not Bit Addressable
- Bit Symbol DISALE 7
- 6 Function
- 5
- 4
- 3
- 2
Intel_Pwd_Exit 1
DISALE 0
When DISALE = 0, ALE is emitted at a constant rate of 1/6 the oscillator frequency (except during MOVX when 1 ALE pulse is missing). When DISALE = 1, ALE is active only during a MOVX or MOVC instruction. When set, this bit configures the interrupt driven exit from power-down to resume execution on the rising edge of the interrupt signal. When this bit is cleared, the execution resumes after a self-timed interval (nominal 2 ms) referenced from the falling edge of the interrupt signal.
Intel_Pwd_Exit
5.2
Clock Register
CLKREG - Clock Register
Reset Value = XXXX XXX0B
The CLKREG register contains a single active bit called X2. Table 5-3.
CLKREG Address = 8FH Not Bit Addressable
- Bit Symbol 7 Function
- 6
- 5
- 4
- 3
- 2
- 1
X2 0
X2
When X2 = 0, the oscillator frequency (at XTAL1 pin) is internally divided by 2 before it is used as the device system frequency. When X2 = 1, the divider by 2 is no longer used and the XTAL1 frequency becomes the device system frequency. This enables the user to choose a 6 MHz crystal instead of a 12 MHz crystal, for example, in order to reduce EMI.
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5.3
SPI Registers
Control and status bits for the Serial Peripheral Interface are contained in registers SPCR (see Table 15-1 on page 26) and SPSR (see Table 15-2 on page 27). The SPI data bits are contained in the SPDR register. In normal SPI mode, writing the SPI data register during serial data transfer sets the Write Collision bit (WCOL) in the SPSR register. In enhanced SPI mode, the SPDR is also write double-buffered because WCOL works as a Write Buffer Full Flag instead of being a collision flag. The values in SPDR are not changed by Reset.
5.4
Interrupt Registers
The global interrupt enable bit and the individual interrupt enable bits are in the IE register. In addition, the individual interrupt enable bit for the SPI is in the SPCR register. Four priorities can be set for each of the six interrupt sources in the IP and IPH registers. IPH bits have the same functions as IP bits, except IPH has higher priority than IP. By using IPH in conjunction with IP, a priority level of 0, 1, 2, or 3 may be set for each interrupt.
5.5
Dual Data Pointer Registers
To facilitate accessing both internal EEPROM and external data memory, two banks of 16-bit Data Pointer Registers are provided: DP0 at SFR address locations 82H - 83H and DP1 at 84H - 85H. Bit DPS = 0 in SFR WMCON selects DP0 and DPS = 1 selects DP1. The user should ALWAYS initialize the DPS bit to the appropriate value before accessing the respective Data Pointer Register.
5.6
Power Off Flag
The Power Off Flag (POF), located at bit_4 (PCON.4) in the PCON SFR. POF, is set to "1" during power up. It can be set and reset under software control and is not affected by RESET.
6. Data Memory - EEPROM and RAM
The AT89S8253 implements 2K bytes of on-chip EEPROM for data storage and 256 bytes of RAM. The upper 128 bytes of RAM occupy a parallel space to the Special Function Registers. That means the upper 128 bytes have the same addresses as the SFR space but are physically separate from SFR space. When an instruction accesses an internal location above address 7FH, the address mode used in the instruction specifies whether the CPU accesses the upper 128 bytes of RAM or the SFR space. Instructions that use direct addressing access the SFR space. For example, the following direct addressing instruction accesses the SFR at location 0A0H (which is P2).
MOV 0A0H, #data
Instructions that use indirect addressing access the upper 128 bytes of RAM. For example, the following indirect addressing instruction, where R0 contains 0A0H, accesses the data byte at address 0A0H, rather than P2 (whose address is 0A0H).
MOV @R0, #data
Note that stack operations are examples of indirect addressing, so the upper 128 bytes of data RAM are available as stack space. The on-chip EEPROM data memory is selected by setting the EEMEN bit in the EECON register at SFR address location 96H. The EEPROM address range is from 000H to 7FFH. MOVX 10
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instructions are used to access the EEPROM. To access off-chip data memory with the MOVX instructions, the EEMEN bit needs to be set to "0". The EEMWE bit in the EECON register needs to be set to "1" before any byte location in the EEPROM can be written. User software should reset EEMWE bit to "0" if no further EEPROM write is required. EEPROM write cycles in the serial programming mode are self-timed and typically take 4 ms. The progress of EEPROM write can be monitored by reading the RDY/BSY bit (read-only) in SFR EECON. RDY/BSY = 0 means programming is still in progress and RDY/BSY = 1 means an EEPROM write cycle is completed and another write cycle can be initiated. Bit EELD in EECON controls whether the next MOVX instruction will only load the write buffer of the EEPROM or will actually start the programming cycle. By setting EELD, only load will occur. Before the last MOVX in a given page of 32 bytes, EELD should be cleared so that after the last MOVX the entire page will be programmed at the same time. This way, 32 bytes will only require 4 ms of programming time instead of 128 ms required in single byte programming. In addition, during EEPROM programming, an attempted read from the EEPROM will fetch the byte being written with the MSB complemented. Once the write cycle is completed, true data are valid at all bit locations.
7. Memory Control Register
The EECON register contains control bits for the 2K bytes of on-chip data EEPROM. It also contains the control bit for the dual data pointer. Table 7-1. EECON - Data EEPROM Control Register
Reset Value = XX00 0011B
EECON Address = 96H Not Bit Addressable
Bit
- 7
- 6
EELD 5
EEMWE 4
EEMEN 3
DPS 2
RDY/BSY 1
WRTINH 0
Symbol
Function EEPROM data memory load enable bit. Used to implement Page Mode Write. A MOVX instruction writing into the data EEPROM will not initiate the programming cycle if this bit is set, rather it will just load data into the volatile data buffer of the data EEPROM memory. Before the last MOVX, reset this bit and the data EEPROM will program all the bytes previously loaded on the same page of the address given by the last MOVX instruction. EEPROM data memory write enable bit. Set this bit to 1 before initiating byte write to on-chip EEPROM with the MOVX instruction. User software should set this bit to 0 after EEPROM write is completed. Internal EEPROM access enable. When EEMEN = 1, the MOVX instruction with DPTR will access on-chip EEPROM instead of external data memory if the address used is less than 2K. When EEMEN = 0 or the address used is 2K, MOVX with DPTR accesses external data memory. Data pointer register select. DPS = 0 selects the first bank of data pointer register, DP0, and DPS = 1 selects the second bank, DP1. RDY/BSY (Ready/Busy) flag for the data EEPROM memory. This is a read-only bit which is cleared by hardware during the programming cycle of the on-chip EEPROM. It is also set by hardware when the programming is completed. Note that RDY/BSY will be cleared long after the completion of the MOVX instruction which has initiated the programming cycle. WRTINH (Write Inhibit) is a READ-ONLY bit which is cleared by hardware when Vcc is too low for the programming cycle of the on-chip EEPROM to be executed. When this bit is cleared, an ongoing programming cycle will be aborted or a new programming cycle will not start.
EELD
EEMWE
EEMEN
DPS
RDY/BSY
WRTINH
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8. Programmable Watchdog Timer
The programmable Watchdog Timer (WDT) counts instruction cycles. The prescaler bits, PS0, PS1 and PS2 in SFR WDTCON are used to set the period of the Watchdog Timer from 16K to 2048K instruction cycles. The available timer periods are shown in Table 8-1. The WDT time-out
period is dependent upon the external clock frequency.
The WDT is disabled by Power-on Reset and during Power-down mode. When WDT times out without being serviced or disabled, an internal RST pulse is generated to reset the CPU. See Table 8-1 for the WDT period selections.
Table 8-1.
Watchdog Timer Time-out Period Selection
WDT Prescaler Bits Period (Nominal for FCLK = 12 MHz) 16 ms 32 ms 64 ms 128 ms 256 ms 512 ms 1024 ms 2048 ms
PS2 0 0 0 0 1 1 1 1
PS1 0 0 1 1 0 0 1 1
PS0 0 1 0 1 0 1 0 1
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8.1 Watchdog Control Register
WDTCON - Watchdog Control Register
Reset Value = 0000 0000B
The WDTCON register contains control bits for the Watchdog Timer (shown in Table 8-2). Table 8-2.
WDTCON Address = A7H Not Bit Addressable
PS2 Bit Symbol PS2 PS1 PS0 WDIDLE 7 Function
PS1 6
PS0 5
WDIDLE 4
DISRTO 3
HWDT 2
WSWRST 1
WDTEN 0
Prescaler bits for the watchdog timer (WDT). When all three bits are cleared to 0, the watchdog timer has a nominal period of 16K machine cycles, (i.e. 16 ms at a XTAL frequency of 24 MHz in normal mode). When all three bits are set to 1, the nominal period is 2048K machine cycles, (i.e. 2048 ms at 24 MHz clock frequency). Disable/enable the Watchdog Timer in IDLE mode. When WDIDLE = 0, WDT continues to count in IDLE mode. When WDIDLE = 1, WDT freezes while the device is in IDLE mode. Disable/enable the WDT-driven Reset Out (WDT drives the RST pin). When DISRTO = 0, the RST pin is driven high after WDT times out and the entire board is reset. When DISRTO = 1, the RST pin remains only as an input and the WDT resets only the microcontroller internally after WDT times out. Hardware mode select for the WDT. When HWDT = 0, the WDT can be turned on/off by simply setting or clearing WDTEN in the same register (this is the software mode for WDT). When HWDT = 1, the WDT has to be set by writing the sequence 1EH/E1H to the WDTRST register (with address 0A6H) and after being set in this way, WDT cannot be turned off except by reset, warm or cold (this is the hardware mode for WDT). To prevent the hardware WDT from resetting the entire device, the same sequence 1EH/E1H must be written to the same WDTRST SFR before the timeout interval. Watchdog software reset bit. When HWDT = 0 (i.e. WDT is in software controlled mode), this bit resets WDT. After being set by software, WSWRST is reset by hardware during the next machine cycle. If HWDT = 1, this bit has no effect, and if set by software, it will not be cleared by hardware. Watchdog software enable bit. When HWDT = 0 (i.e. WDT is in software-controlled mode), this bit enables WDT when set to 1 and disables WDT when cleared to 0 (it does not reset WDT in this case, but just freezes the existing counter state). If HWDT = 1, this bit is READ-ONLY and reflects the status of the WDT (whether it is running or not).
DISRTO
HWDT
WSWRST
WDTEN
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9. Timer 0 and 1
Timer 0 and Timer 1 in the AT89S8253 operate the same way as Timer 0 and Timer 1 in the AT89S51 and AT89S52. For more detailed information on the Timers' operation, refer to the Atmel Web site (www.atmel.com). From the home page, select "Products," then "Microcontrollers", then "8051-Architecture", then "Documentation", and "Other Documents". Open the Adobe Acrobat file "AT89 Series Hardware Description."
10. Timer 2
Timer 2 is a 16-bit Timer/Counter that can operate as either a timer or an event counter. The type of operation is selected by bit C/T2 in the SFR T2CON (see Table 10-2 on page 15). Timer 2 has three operating modes: capture, auto-reload (up or down counting), and baud rate generator. The modes are selected by bits in T2CON, as shown in Table 10-2. Timer 2 consists of two 8-bit registers, TH2 and TL2. In the Timer function, the TL2 register is incremented every machine cycle. Since a machine cycle consists of 12 oscillator periods, the count rate is 1/12 of the oscillator frequency. In the Counter function, the register is incremented in response to a 1-to-0 transition at its corresponding external input pin, T2. In this function, the external input is sampled during S5P2 of every machine cycle. When the samples show a high in one cycle and a low in the next cycle, the count is incremented. The new count value appears in the register during S3P1 of the cycle following the one in which the transition was detected. Since two machine cycles (24 oscillator periods) are required to recognize a 1-to-0 transition, the maximum count rate is 1/24 of the oscillator frequency. To ensure that a given level is sampled at least once before it changes, the level should be held for at least one full machine cycle. Table 10-1. Timer 2 Operating Modes
CP/RL2 0 1 X X TR2 1 1 1 0 MODE 16-bit Auto-reload 16-bit Capture Baud Rate Generator (Off)
RCLK + TCLK 0 0 1 X
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Table 10-2. T2CON - Timer/Counter 2 Control Register
Reset Value = 0000 0000B T2CON Address = 0C8H Bit Addressable TF2 Bit Symbol TF2 7 Function Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either RCLK = 1 or TCLK = 1. Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2 = 1. When Timer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1). Receive clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in serial port Modes 1 and 3. RCLK = 0 causes Timer 1 overflows to be used for the receive clock. Transmit clock enable. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in serial port Modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for the transmit clock. Timer 2 external enable. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if Timer 2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to ignore events at T2EX. Start/Stop control for Timer 2. TR2 = 1 starts the timer. Timer or counter select for Timer 2. C/T2 = 0 for timer function. C/T2 = 1 for external event counter (falling edge triggered). Capture/Reload select. CP/RL2 = 1 causes captures to occur on negative transitions at T2EX if EXEN2 = 1. CP/RL2 = 0 causes automatic reloads to occur when Timer 2 overflows or negative transitions occur at T2EX when EXEN2 = 1. When either RCLK or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow. EXF2 6 RCLK 5 TCLK 4 EXEN2 3 TR2 2 C/T2 1 CP/RL2 0
EXF2
RCLK TCLK EXEN2 TR2 C/T2
CP/RL2
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10.1
Timer 2 Registers
Control and status bits are contained in registers T2CON (see Table 10-2) and T2MOD (see Table 10-3) for Timer 2. The register pair (RCAP2H, RCAP2L) are the Capture/Reload registers for Timer 2 in 16-bit capture mode or 16-bit auto-reload mode.
10.2
Capture Mode
In the capture mode, two options are selected by bit EXEN2 in T2CON. If EXEN2 = 0, Timer 2 is a 16-bit timer or counter which upon overflow sets bit TF2 in T2CON. This bit can then be used to generate an interrupt. If EXEN2 = 1, Timer 2 performs the same operation, but a 1-to-0 transition at external input T2EX also causes the current value in TH2 and TL2 to be captured into RCAP2H and RCAP2L, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set. The EXF2 bit, like TF2, can generate an interrupt. The capture mode is illustrated in Figure 10-1.
Figure 10-1. Timer 2 in Capture Mode
OSC /12 C/T2 = 0 TH2 CONTROL C/T2 = 1 T2 PIN TRANSITION DETECTOR T2EX PIN CONTROL EXEN2 EXF2 TR2 CAPTURE RCAP2H RCAP2L TIMER 2 INTERRUPT TL2 TF2 OVERFLOW
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10.3 Auto-reload (Up or Down Counter)
Timer 2 can be programmed to count up or down when configured in its 16-bit auto-reload mode. This feature is invoked by the DCEN (Down Counter Enable) bit located in the SFR T2MOD (see Table 10-3). Upon reset, the DCEN bit is set to 0 so that timer 2 will default to count up. When DCEN is set, Timer 2 can count up or down, depending on the value of the T2EX pin. Table 10-3. T2MOD - Timer 2 Mode Control Register
Reset Value = XXXX XX00B
T2MOD Address = 0C9H Not Bit Addressable - Bit Symbol - T2OE DCEN 7 Function Not implemented, reserved for future use. Timer 2 Output Enable bit. When set, this bit allows Timer 2 to be configured as an up/down counter. - 6 - 5 - 4 - 3 - 2
T2OE 1
DCEN 0
Figure 10-2 shows Timer 2 automatically counting up when DCEN = 0. In this mode, two options are selected by bit EXEN2 in T2CON. If EXEN2 = 0, Timer 2 counts up to 0FFFFH and then sets the TF2 bit upon overflow. The overflow also causes the timer registers to be reloaded with the 16-bit value in RCAP2H and RCAP2L. The values in RCAP2H and RCAP2L are preset by software. If EXEN2 = 1, a 16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at external input T2EX. This transition also sets the EXF2 bit. Both the TF2 and EXF2 bits can generate an interrupt if enabled. Setting the DCEN bit enables Timer 2 to count up or down, as shown in Figure 10-3. In this mode, the T2EX pin controls the direction of the count. A logic 1 at T2EX makes Timer 2 count up. The timer will overflow at 0FFFFH and set the TF2 bit. This overflow also causes the 16-bit value in RCAP2H and RCAP2L to be reloaded into the timer registers, TH2 and TL2, respectively. A logic 0 at T2EX makes Timer 2 count down. The timer underflows when TH2 and TL2 equal the values stored in RCAP2H and RCAP2L. The underflow sets the TF2 bit and causes 0FFFFH to be reloaded into the timer registers. The EXF2 bit toggles whenever Timer 2 overflows or underflows and can be used as a 17th bit of resolution. In this operating mode, EXF2 does not flag an interrupt.
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Figure 10-2. Timer 2 in Auto Reload Mode (DCEN = 0)
Figure 10-3.
Timer 2 Auto Reload Mode (DCEN = 1 Timer 2 Auto Reload Mode (DCEN = 1)
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Figure 10-4. Timer 2 in Baud Rate Generator Mode
TIMER 1 OVERFLOW
/2
"0" NOTE: OSC. FREQ. IS DIVIDED BY 2, NOT 12 SMOD1 OSC "1"
/2
C/T2 = 0 "1" TH2 CONTROL TR2 C/T2 = 1 "1" "0" TCLK Tx CLOCK TL2 RCLK Rx CLOCK "0"
/16
T2 PIN RCAP2H RCAP2L TRANSITION DETECTOR T2EX PIN CONTROL EXEN2 EXF2 TIMER 2 INTERRUPT
/ 16
11. Baud Rate Generator
Timer 2 is selected as the baud rate generator by setting TCLK and/or RCLK in T2CON (Table 10-2). Note that the baud rates for transmit and receive can be different if Timer 2 is used for the receiver or transmitter and Timer 1 is used for the other function. Setting RCLK and/or TCLK puts Timer 2 into its baud rate generator mode, as shown in Figure 10-4. The baud rate generator mode is similar to the auto-reload mode, in that a rollover in TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. The baud rates in Modes 1 and 3 are determined by Timer 2's overflow rate according to the following equation. Timer 2 Overflow Rate Modes 1 and 3 Baud Rates = ----------------------------------------------------------16 The Timer can be configured for either timer or counter operation. In most applications, it is configured for timer operation (CP/T2 = 0). The timer operation is different for Timer 2 when it is used as a baud rate generator. Normally, as a timer, it increments every machine cycle (at 1/12 the oscillator frequency). As a baud rate generator, however, it increments every state time (at 1/2 the oscillator frequency). The baud rate formula is given below. Modes 1 and 3 Oscillator Frequency -------------------------------------- = --------------------------------------------------------------------------------------------Baud Rate 32 x [ 65536 - ( RCAP2H,RCAP2L ) ]
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where (RCAP2H, RCAP2L) is the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. Timer 2 as a baud rate generator is shown in Figure 10-4. This figure is valid only if RCLK or TCLK = 1 in T2CON. Note that a rollover in TH2 does not set TF2 and will not generate an interrupt. Note too, that if EXEN2 is set, a 1-to-0 transition in T2EX will set EXF2 but will not cause a reload from (RCAP2H, RCAP2L) to (TH2, TL2). Thus when Timer 2 is in use as a baud rate generator, T2EX can be used as an extra external interrupt. Note that when Timer 2 is running (TR2 = 1) as a timer in the baud rate generator mode, TH2 or TL2 should not be read from or written to. Under these conditions, the Timer is incremented every state time, and the results of a read or write may not be accurate. The RCAP2 registers may be read but should not be written to, because a write might overlap a reload and cause write and/or reload errors. The timer should be turned off (clear TR2) before accessing the Timer 2 or RCAP2 registers.
12. Programmable Clock Out
A 50% duty cycle clock can be programmed to come out on P1.0, as shown in Figure 12-1. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed to input the external clock for Timer/Counter 2 or to output a 50% duty cycle clock ranging from 61 Hz to 4 MHz (for a 16 MHz operating frequency). To configure the Timer/Counter 2 as a clock generator, bit C/T2 (T2CON.1) must be cleared and bit T2OE (T2MOD.1) must be set. Bit TR2 (T2CON.2) starts and stops the timer. The clock-out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers (RCAP2H, RCAP2L), as shown in the following equation.
Oscillator Frequency Clock Out Frequency = -----------------------------------------------------------------------------------------4 x [ 65536 - ( RCAP2H,RCAP2L ) ]
In the clock-out mode, Timer 2 rollovers will not generate an interrupt. This behavior is similar to when Timer 2 is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate and clock-out frequencies cannot be determined independently from one another since they both use RCAP2H and RCAP2L.
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Figure 12-1. Timer 2 in Clock-out Mode
13. UART
The UART in the AT89S8253 operates the same way as the UART in the AT89S51 and AT89S52. For more detailed information on the UART operation refer to the Atmel Web site (www.atmel.com). From the home page, select "Products," then "Microcontrollers", then "8051Architecture," then "Documentation", and "Other Documents". Open the Adobe Acrobat file "AT89 Series Hardware Description."
13.1
Enhanced UART
In addition to all of its usual modes, the UART can perform framing error detection by looking for missing stop bits, and automatic address recognition. The UART also fully supports multiprocessor communication as does the standard 80C51 UART. When used for framing error detect, the UART looks for missing stop bits in the communication. A missing bit will set the FE bit in the SCON register. The FE bit shares the SCON.7 bit with SM0 and the function of SCON.7 is determined by PCON.6 (SMOD0). If SMOD0 is set then SCON.7 functions as FE. SCON.7 functions as SM0 when SMOD0 is cleared. When used as FE, SCON.7 can only be cleared by software.
13.1.1
Automatic Address Recognition Automatic Address Recognition is a feature which allows the UART to recognize certain addresses in the serial bit stream by using hardware to make the comparisons. This feature saves a great deal of software overhead by eliminating the need for the software to examine every serial address which passes by the serial port. This feature is enabled by setting the SM2 bit in SCON. In the 9-bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be automatically set when the received byte contains either the "Given" address or the "Broad-
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cast" address. The 9-bit mode requires that the 9th information bit is a 1 to indicate that the received information is an address and not data. The 8-bit mode is called mode 1. In this mode the RI flag will be set if SM2 is enabled and the information received has a valid stop bit following the 8 address bits and the information is either a Given or Broadcast address. Mode 0 is the Shift Register mode and SM2 is ignored. Using the Automatic Address Recognition feature allows a master to selectively communicate with one or more slaves by invoking the given slave address or addresses. All of the slaves may be contacted by using the Broadcast address. Two special Function Registers are used to define the slave's address, SADDR, and the address mask, SADEN. SADEN is used to define which bits in the SADDR are to be used and which bits are "don't care". The SADEN mask can be logically ANDed with the SADDR to create the "Given" address which the master will use for addressing each of the slaves. Use of the Given address allows multiple slaves to be recognized while excluding others. The following examples will help to show the versatility of this scheme: Slave 0 SADDR = 1100 0000 SADEN = 1111 1101 Given = 1100 00X0
Slave 1
SADDR = 1100 0000 SADEN = 1111 1110 Given = 1100 000X
In the previous example SADDR is the same and the SADEN data is used to differentiate between the two slaves. Slave 0 requires a 0 in bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is ignored. A unique address for slave 0 would be 1100 0010 since slave 1 requires a 0 in bit 1. A unique address for slave 1 would be 1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be selected at the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed with 1100 0000. In a more complex system the following could be used to select slaves 1 and 2 while excluding slave 0: Slave 0 SADDR = 1100 0000 SADEN = 1111 1001 Given = 1100 0XX0
Slave 1
SADDR = 1110 0000 SADEN = 1111 1010 Given = 1110 0X0X
Slave 2
SADDR = 1110 0000 SADEN = 1111 1100 Given = 1110 00XX
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In the previous example the differentiation among the 3 slaves is in the lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 and 0101. Slave 2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and 1 and exclude Slave 2, use address 1110 0100, since it is necessary to make bit 2 = 1 to exclude slave 2. The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zeros in this result are trended as don't-cares. In most cases, interpreting the don'tcares as ones, the broadcast address will be FF hexadecimal. Upon reset SADDR (SFR address 0A9H) and SADEN (SFR address 0B9H) are loaded with 0s. This produces a given address of all "don't cares" as well as a Broadcast address of all "don't cares". This effectively disables the Automatic Addressing mode and allows the microcontroller to use standard 80C51-type UART drivers which do not make use of this feature. Table 13-1. SCON - Serial Port Control Register
Reset Value = 0000 0000B
SCON Address = 98H Bit Addressable SM0/FE Bit 7 (SMOD = 0/1) Symbol FE SM0
(1)
SM1 6
SM2 5
REN 4
TB8 3
RB8 2
T1 1
RI 0
Function Framing error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit. FE will be set regardless of the state of SMOD. Serial Port Mode Bit 0, (SMOD must = 0 to access bit SM0) Serial Port Mode Bit 1 SM0 0 SM1 0 1 0 1 Mode 0 1 2 3 Description shift register 8-bit UART 9-bit UART 9-bit UART Baud Rate(2) fosc/12 variable fosc/64 or fosc/32 variable
SM1
0 1 1
SM2
Enables the Automatic Address Recognition feature in modes 2 or 3. If SM2 = 1 then Rl will not be set unless the received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address. In mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a Given or Broadcast Address. In Mode 0, SM2 should be 0.
REN TB8 RB8 TI RI Notes:
Enables serial reception. Set by software to enable reception. Clear by software to disable reception. The 9th data bit that will be transmitted in modes 2 and 3. Set or clear by software as desired. In modes 2 and 3, the 9th data bit that was received. In mode 1, if SM2 = 0, RB8 is the stop bit that was received. In mode 0, RB8 is not used. Transmit interrupt flag. Set by hardware at the end of the 8th bit time in mode 0, or at the beginning of the stop bit in the other modes, in any serial transmission. Must be cleared by software. Receive interrupt flag. Set by hardware at the end of the 8th bit time in mode 0, or halfway through the stop bit time in the other modes, in any serial reception (except see SM2). Must be cleared by software.
1. SMOD is located at PCON.7. 2. fosc = oscillator frequency.
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15. Serial Peripheral Interface
The serial peripheral interface (SPI) allows high-speed synchronous data transfer between the AT89S8253 and peripheral devices or between multiple AT89S8253 devices. The AT89S8253 SPI features include the following: * Full-Duplex, 3-Wire Synchronous Data Transfer * Master or Slave Operation * Maximum Bit Frequency = f/4 (f/2 if in x2 Clock Mode) * LSB First or MSB First Data Transfer * Four Programmable Bit Rates in Master Mode * End of Transmission Interrupt Flag * Write Collision Flag Protection * Double-Buffered Receive * Double-Buffered Transmit (Enhanced Mode only) * Wakeup from Idle Mode (Slave Mode only) The interconnection between master and slave CPUs with SPI is shown in Figure 15-1. The four pins in the interface are Master-In/Slave-Out (MISO), Master-Out/Slave-In (MOSI), Shift Clock (SCK), and Slave Select (SS). The SCK pin is the clock output in master mode, but is the clock input in slave mode. The MSTR bit in SPCR determines the directions of MISO and MOSI. Also notice that MOSI connects to MOSI and MISO to MISO. In master mode, SS/P1.4 is ignored and may be used as a general-purpose input or output. In slave mode, SS must be driven low to select an individual device as a slave. When SS is driven high, the slave's SPI port is deactivated and the MOSI/P1.5 pin can be used as a general-purpose input. Figure 15-1. SPI Master-Slave Interconnection
MSB MASTER LSB
MISO MISO
MSB
SLAVE
LSB
8-BIT SHIFT REGISTER
MOSI MOSI
8-BIT SHIFT REGISTER
SPI CLOCK GENERATOR
SCK SS VCC
SCK SS
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Figure 15-2. SPI Block Diagram
S OSCILLATOR MSB LSB
8/16-BIT SHIFT REGISTER
MISO P1.6
S
DIVIDER /4/16/64/128
READ DATA BUFFER
WRITE DATA BUFFER
SPI CLOCK (MASTER)
CLOCK CLOCK LOGIC S M
PIN CONTROL LOGIC
M M
MOSI P1.5
SELECT
SPR1 SPR0
SCK 1.7 SS P1.4
SPI CONTROL
WCOL SPIF
MSTR SPE
DORD MSTR CPHA CPOL SPR1 SPR0
SPIE
8
SPI STATUS REGISTER
SPI CONTROL REGISTER
8
8
SPI INTERRUPT INTERNAL REQUEST DATA BUS
The SPI has two modes of operation: normal (non-buffered write) and enhanced (buffered write). In normal mode, writing to the SPI data register (SPDR) of the master CPU starts the SPI clock generator and the data written shifts out of the MOSI pin and into the MOSI pin of the slave CPU. Transmission may start after an initial delay while the clock generator waits for the next full bit slot of the specified baud rate. After shifting one byte, the SPI clock generator stops, setting the end of transmission flag (SPIF) and transferring the received byte to the read buffer (SPDR). If both the SPI interrupt enable bit (SPIE) and the serial port interrupt enable bit (ES) are set, an interrupt is requested. Note that SPDR refers to either the write data buffer or the read data buffer, depending on whether the access is a write or read. In normal mode, because the write buffer is transparent (and a write access to SPDR will be directed to the shift buffer), any attempt to write to SPDR while a transmission is in progress will result in a write collision with WCOL set. However, the transmission will still complete normally, but the new byte will be ignored and a new write access to SPDR will be necessary. Enhanced mode is similar to normal mode except that the write buffer holds the next byte to be transmitted. Writing to SPDR loads the write buffer and sets WCOL to signify that the buffer is full and any further writes will overwrite the buffer. WCOL is cleared by hardware when the buffered byte is loaded into the shift register and transmission begins. If the master SPI is currently idle, i.e. if this is the first byte, then after loading SPDR, transmission of the byte starts and WCOL is cleared immediately. While this byte is transmitting, the next byte may be written to SPDR. The Load Enable flag (LDEN) in SPSR can be used to determine when transmission has started. LDEN is asserted during the first four bit slots of a SPI transfer. The master CPU should first check that LDEN is set and that WCOL is cleared before loading the next byte. In enhanced mode, if WCOL is set when a transfer completes, i.e. the next byte is available, then the SPI immediately loads the buffered byte into the shift register, resets WCOL, and continues transmission without stopping and restarting the clock generator. As long as the CPU can keep the write buffer full in this manner, multiple bytes may be transferred with minimal latency between bytes.
SPE
DORD
MSTR
SPE
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Table 15-1.
SPCR - SPI Control Register
Reset Value = 0000 0100B
SPCR Address = D5H Not Bit Addressable
SPIE Bit Symbol SPIE SPE DORD MSTR CPOL CPHA 7 Function
SPE 6
DORD 5
MSTR 4
CPOL 3
CPHA 2
SPR1 1
SPR0 0
SPI interrupt enable. This bit, in conjunction with the ES bit in the IE register, enables SPI interrupts: SPIE = 1 and ES = 1 enable SPI interrupts. SPIE = 0 disables SPI interrupts. SPI enable. SPI = 1 enables the SPI channel and connects SS, MOSI, MISO and SCK to pins P1.4, P1.5, P1.6, and P1.7. SPI = 0 disables the SPI channel. Data order. DORD = 1 selects LSB first data transmission. DORD = 0 selects MSB first data transmission. Master/slave select. MSTR = 1 selects Master SPI mode. MSTR = 0 selects slave SPI mode. Clock polarity. When CPOL = 1, SCK is high when idle. When CPOL = 0, SCK of the master device is low when not transmitting. Please refer to figure on SPI clock phase and polarity control. Clock phase. The CPHA bit together with the CPOL bit controls the clock and data relationship between master and slave. Please refer to figure on SPI clock phase and polarity control. SPI clock rate select. These two bits control the SCK rate of the device configured as master. SPR1 and SPR0 have no effect on the slave. The relationship between SCK and the oscillator frequency, FOSC., is as follows: SPR1SPR0SCK = FOSC. divided by: 004 0 1 16 1 0 64 1 1 128 1. Set up the clock mode before enabling the SPI: set all bits needed in SPCR except the SPE bit, then set SPE. 2. Enable the master SPI prior to the slave device. 3. Slave echoes master on next Tx if not loaded with new data.
SPR0 SPR1
Notes:
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Table 15-2. SPSR - SPI Status Register
Reset Value = 000X XX00B SPSR Address = AAH Not Bit Addressable
SPIF Bit Symbol SPIF 7 Function
WCOL 6
LDEN 5
- 4
- 3
- 2
DISSO 1
ENH 0
SP interrupt flag. When a serial transfer is complete, the SPIF bit is set and an interrupt is generated if SPIE = 1 and ES = 1. The SPIF bit is cleared by reading the SPI status register followed by reading/writing the SPI data register. When ENH = 0: Write collision flag. The WCOL bit is set if the SPI data register is written during a data transfer. During data transfer, the result of reading the SPDR register may be incorrect, and writing to it has no effect. The WCOL bit (and the SPIF bit) are cleared by reading the SPI status register followed by reading/writing the SPI data register. When ENH = 1: WCOL works in Enhanced mode as Tx Buffer Full. Writing during WCOL = 1 in enhanced mode will overwrite the waiting data already present in the Tx Buffer. In this mode, WCOL is no longer reset by the SPIF reset but is reset when the write buffer has been unloaded into the serial shift register. Load enable for the Tx buffer in enhanced SPI mode. When ENH is set, it is safe to load the Tx Buffer while LDEN = 1 and WCOL = 0. LDEN is high during bits 0 - 3 and is low during bits 4 - 7 of the SPI serial byte transmission time frame. Disable slave output bit. When set, this bit causes the MISO pin to be tri-stated so more than one slave device can share the same interface with a single master. Normally, the first byte in a transmission could be the slave address and only the selected slave should clear its DISSO bit. Enhanced SPI mode select bit. When ENH = 0, SPI is in normal mode, i.e. without write double buffering. When ENH = 1, SPI is in enhanced mode with write double buffering. The Tx buffer shares the same address with the SPDR register.
WCOL
LDEN
DISSO
ENH
Table 15-3.
SPDR - SPI Data Register
Reset Value = 00H (after cold reset) unchanged (after warm reset)
SPDR Address = 86H Not Bit Addressable
SPD7 Bit 7
SPD6 6
SPD5 5
SPD4 4
SPD3 3
SPD2 2
SPD1 1
SPD0 0
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Figure 15-3. SPI Shift Register Diagram
7
Serial In
8
Serial Master
2:1 MUX D LATCH CLK Q 2:1 MUX
Serial Slave
D LATCH CLK Q Serial Out
8
Parallel Master
Transmit Byte (Write Buffer)
8
Parallel Slave
(Read Buffer)
8
D LATCH CLK
Q
D LATCH CLK
Q
8
Receive Byte
The CPHA (Clock PHAse), CPOL (Clock POLarity), and SPR (Serial Peripheral clock Rate = baud rate) bits in SPCR control the shape and rate of SCK. The two SPR bits provide four possible clock rates when the SPI is in master mode. In slave mode, the SPI will operate at the rate of the incoming SCK as long as it does not exceed the maximum bit rate. There are also four possible combinations of SCK phase and polarity with respect to the serial data. CPHA and CPOL determine which format is used for transmission. The SPI data transfer formats are shown in Figure 15-4 and Figure 15-5. To prevent glitches on SCK from disrupting the interface, CPHA, CPOL, and SPR should be set up before the interface is enabled, and the master device should be enabled before the slave device(s).
Table 15-4.
Symbol tCLCL tSCK tSHSL tSLSH tSR tSF tSIS tSIH tSOH tSOV
SPI Master Characteristics
Parameter Oscillator Period Serial Clock Cycle Time Clock High Time Clock Low Time Rise Time Fall Time Serial Input Setup Time Serial Input Hold Time Serial Output Hold Time Serial Output Valid Time 10 10 10 35 Min 41.6 4tCLCL tSCK/2 - 25 tSCK/2 - 25 25 25 Max Units ns ns ns ns ns ns ns ns ns ns
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Table 15-5.
Symbol tCLCL tSCK tSHSL tSLSH tSR tSF tSIS tSIH tSOH tSOV tSOE tSOX tSSE tSSD
SPI Slave Characteristics
Parameter Oscillator Period Serial Clock Cycle Time Clock High Time Clock Low Time Rise Time Fall Time Serial Input Setup Time Serial Input Hold Time Serial Output Hold Time Serial Output Valid Time Output Enable Time Output Disable Time Slave Enable Lead Time Slave Disable Lag Time 10 0 10 10 10 35 10 25 Min 41.6 4tCLCL 1.5 tCLCL - 25 1.5 tCLCL - 25 25 25 Max Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Figure 15-4. SPI Master Timing (CPHA = 0)
SS
tSCK tSR tSLSH tSF
SCK (CPOL = 0) SCK (CPOL = 1)
tSHSL
tSLSH
tSHSL tSIS tSIH
MISO
tSOH tSOV
MOSI
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Figure 15-5. SPI Slave Timing (CPHA = 0)
SS
tSSE tSCK tSHSL tSR tSLSH tSF tSSD
SCK (CPOL = 0) SCK (CPOL= 1)
tSOE
tSLSH
tSHSL tSOV tSOH tSIS tSIH tSOX
MISO
MOSI
Figure 15-6. SPI Master Timing (CPHA = 1)
SS
tSCK tSHSL tSLSH
tSF tSR
SCK (CPOL = 0) SCK (CPOL = 1) MISO MOSI
tSLSH
tSHSL tSIS tSIH
tSOH
tSOV
Figure 15-7. SPI Slave Timing (CPHA = 1)
SS
tSSE tSCK tSF tSR tSSD
SCK (CPOL = 0) SCK (CPOL = 1)
tSOE
tSHSL
tSLSH
tSLSH
tSHSL
tSOV tSOH tSOX
MISO
tSIS tSIH
MOSI
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Figure 15-8. SPI Transfer Format with CPHA = 0
Note:
*Not defined but normally MSB of character just received
Figure 15-9. SPI Transfer Format with CPHA = 1
SCK CYCLE # (FOR REFERENCE) SCK (CPOL = 0) SCK (CPOL = 1) MOSI (FROM MASTER) MISO (FROM SLAVE) SS (TO SLAVE)
MSB 6 6 5 5 4 4 3 3 2 2 1 1 LSB LSB
1
2
3
4
5
6
7
8
*
MSB
Note:
*Not defined but normally LSB of previously transmitted character
16. Interrupts
The AT89S8253 has a total of six interrupt vectors: two external interrupts (INT0 and INT1), three timer interrupts (Timers 0, 1, and 2), and the serial port interrupt. These interrupts are all shown in Figure 16-1. Each of these interrupt sources can be individually enabled or disabled by setting or clearing a bit in Special Function Register IE. IE also contains a global disable bit, EA, which disables all interrupts at once. Note that Table 16-1 shows that bit position IE.6 is unimplemented. User software should not write a 1 to this bit position, since it may be used in future AT89 products. Timer 2 interrupt is generated by the logical OR of bits TF2 and EXF2 in register T2CON. Neither of these flags is cleared by hardware when the service routine is vectored to. In fact, the service routine may have to determine whether it was TF2 or EXF2 that generated the interrupt, and that bit will have to be cleared in software. The serial interrupt is the logical OR of bits RI and TI in register SCON and also bit SPIF in SPSR (if SPIE in SPCR is set). None of these flags is cleared by hardware when the service routine is vectored to. The service routine may have to determine whether the UART or SPI generated the interrupt. The Timer 0 and Timer 1 flags, TF0 and TF1, are set at S5P2 of the cycle in which the timers overflow. The values are then polled by the circuitry in the next cycle. However, the Timer 2 flag, TF2, is set at S2P2 and is polled in the same cycle in which the timer overflows.
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Table 16-1.
Interrupt Enable (IE) Register
Reset Value = 0X00 0000B
IE Address = A8H Bit Addressable
EA
-
ET2
ES
ET1
EX1
ET0
EX0
Enable Bit = 1 enables the interrupt. Enable Bit = 0 disables the interrupt. Symbol EA - ET2 ES ET1 EX1 ET0 EX0 Position IE.7 IE.6 IE.5 IE.4 IE.3 IE.2 IE.1 IE.0 Function Disables all interrupts. If EA = 0, no interrupt is acknowledged. If EA = 1, each interrupt source is individually enabled or disabled by setting or clearing its enable bit. Reserved. Timer 2 interrupt enable bit. SPI and UART interrupt enable bit. Timer 1 interrupt enable bit. External interrupt 1 enable bit. Timer 0 interrupt enable bit. External interrupt 0 enable bit.
User software should never write 1s to reserved bits, because they may be used in future AT89 products.
Figure 16-1. Interrupt Sources
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17. Oscillator Characteristics
XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier that can be configured for use as an on-chip oscillator, as shown in Figure 17-1. Either a quartz crystal or ceramic resonator may be used. To drive the device from an external clock source, XTAL2 should be left unconnected while XTAL1 is driven, as shown in Figure 17-2. Figure 17-1. Oscillator Connections
Note:
C1, C2 = 30 pF 10 pF for Crystals = 40 pF 10 pF for Ceramic Resonators
Figure 17-2. External Clock Drive Configuration
18. Idle Mode
In idle mode, the CPU puts itself to sleep while all the on-chip peripherals remain active. This mode is invoked by software. The content of the on-chip RAM and all the special functions registers remain unchanged during this mode. The idle mode can be terminated by any enabled interrupt or by a hardware reset. Note that when idle mode is terminated by a hardware reset, the device normally resumes program execution from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write to a port pin when idle mode is terminated by a reset, the instruction following the one that invokes idle mode should not write to a port pin or to external memory. Table 18-1.
Mode Idle Idle Power-down Power-down
Status of External Pins During Idle and Power-down Modes
Program Memory Internal External Internal External ALE 1 1 0 0 PSEN 1 1 0 0 PORT0 Data Float Data Float PORT1 Data Data Data Data PORT2 Data Address Data Data PORT3 Data Data Data Data
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19. Power-down Mode
In the power-down mode, the oscillator is stopped and the instruction that invokes power-down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values until the power-down mode is terminated. Exit from power-down can be initiated either by a hardware reset or by an enabled external interrupt. Reset redefines the SFRs but does not change the on-chip RAM. The reset should not be activated before VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize. To exit power-down via an interrupt, external interrupt pin P3.2 or P3.3 must be kept low for at least the specified required crystal oscillator start up time. Afterwards, the interrupt service routine starts at the rising edge of the external interrupt pin if the SFR bit AUXR.1 is set. If AUXR.1 is reset (cleared), execution starts after a self-timed interval of 2 ms (nominal) from the falling edge of the external interrupt pin.
20. Program Memory Lock Bits
The AT89S8253 has three lock bits that can be left unprogrammed (U) or can be programmed (P) to obtain the additional features listed in Table 20-1. When lock bit 1 is programmed, the logic level at the EA pin is sampled and latched during reset. If the device is powered up without a reset, the latch initializes to a random value and holds that value until reset is activated. The latched value of EA must agree with the current logic level at that pin in order for the device to function properly. Once programmed, the lock bits can only be unprogrammed with the Chip Erase operation in either the parallel or serial modes. Table 20-1. Lock Bit Protection Modes(1)
Program Lock Bits LB1 1 U LB2 U LB3 U Protection Type No internal memory lock feature. MOVC instructions executed from external program memory are disabled from fetching code bytes from internal memory. EA is sampled and latched on reset and further programming of the Flash memory (parallel or serial mode) is disabled. Same as Mode 2, but parallel or serial verify are also disabled. Same as Mode 3, but external execution is also disabled.
2
P
U
U
3 4 Note:
P P
P P
U P
1. U = Unprogrammed P = Programmed
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21. Programming the Flash and EEPROM
Atmel's AT89S8253 Flash microcontroller offers 12K bytes of In-System reprogrammable Flash code memory and 2K bytes of EEPROM data memory. The AT89S8253 is normally shipped with the on-chip Flash code and EEPROM data memory arrays in the erased state (i.e. contents = FFH) and ready to be programmed. This device supports a parallel programming mode and a serial programming mode. The serial programming mode provides a convenient way to reprogram the AT89S8253 inside the user's system. The parallel programming mode is compatible with conventional third-party Flash or EPROM programmers. The code and data memory arrays are mapped via separate address spaces in the parallel and serial programming modes: 0000H to 2FFFH for code memory and 000H to 7FFH for data memory. The code and data memory arrays in the AT89S8253 are programmed byte-by-byte or by page in either programming mode. To reprogram any non-blank byte in the parallel or serial mode, the user needs to invoke the Chip Erase operation first to erase both arrays. Parallel Programming Algorithm: To program and verify the AT89S8253 in the parallel programming mode, the following sequence is recommended (see Figure 27-1): 1. Power-up sequence: a. Apply power between VCC and GND pins. b. c. Set RST pin to "H". Apply a 3 MHz to 24 MHz clock to XTAL1 pin and wait for at least 10 ms.
2. Set PSEN pin to "L" a. ALE pin to "H" b. EA pin to "H" and all other pins to "H". 3. Raise EA/VPP to 12V to enable Flash programming, erase or verification. Enable the P3.0 pull-up (10 K typical) for RDY/BSY operation. 4. Apply the appropriate combination of "H" or "L" logic levels to pins P3.3, P3.4, P3.5, P3.6, P3.7 to select one of the programming operations shown in the Flash Programming Modes table. 5. Apply the desired byte address to pins P1.0 to P1.7 and P2.0 to P2.5. a. Apply data to pins P0.0 to P0.7 for write code operation. 6. Pulse ALE/PROG once to load a byte in the code memory array, the data memory array, or the lock bits. 7. Repeat steps 5 and 6, changing the address and data for up to 64 bytes in the code memory page or 32 bytes in the data memory (EEPROM) page. When loading a page with individual bytes, the interval between consecutive byte loads should be no longer than 150 s. Otherwise the device internally times out and assumes that the page load sequence is completed, rejecting any further loads before the page programming sequence has finished. This timing restriction also applies to Page Write of the 64-byte User Row. 8. After the last byte of the current page has been loaded, wait for 5 ms or monitor the RDY/BUSY pin until it transitions high. The page write cycle is self-timed and typically takes less than 5 ms. 9. To verify the last byte of the page just programmed, bring pin P3.4 to "L" and read the programmed data at pins P0.0 to P0.7.
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10. Repeat steps 4 through 7 changing the address and data for the entire array or until the end of the object file is reached. 11. Power-off sequence: a. Tri-state the address and data inputs. b. c. Disable the P3.0 pullup used for RDY/BUSY operation. Set XTAL1 to "L".
d. Set RST and EA pins to "L". e. Turn VCC power off. Data Polling: The AT89S8253 features DATA Polling to indicate the end of any programming cycle. During a write cycle in the parallel or serial programming mode, an attempted read of the last loaded byte will result in the complement of the written datum on P0.7 (parallel mode), and on the MSB of the serial output byte on MISO (serial mode). Once the write cycle has been completed, true data are valid on all outputs, and the next cycle may begin. DATA Polling may begin any time after a write cycle has been initiated. Ready/Busy: The progress of byte programming in the parallel programming mode can also be monitored by the RDY/BSY output signal. Pin P3.0 is pulled Low after ALE goes High during programming to indicate BUSY. P3.0 is pulled High again when programming is done to indicate READY. P3.0 needs an external pullup (typical 10 K) when functioning as RDY/BSY. Program Verify: If lock bits LB1 and LB2 have not been programmed, the programmed Code or Data byte can be read back via the address and data lines for verification. The state of the lock bits can also be verified directly in the parallel and serial programming modes. Chip Erase: Both Flash and EEPROM arrays are erased electrically at the same time. In the parallel programming mode, Chip Erase is initiated by using the proper combination of control signals. The code and data arrays are written with all "1"s during the Chip Erase operation. The User Row will also be erased if the UsrRowProEn fuse (Fuse3) = 0 (enabled state). In the serial programming mode, a chip erase operation is initiated by issuing the Chip Erase instruction. In this mode, Chip Erase is self-timed and also takes about 8 ms. During Chip Erase, a serial read from any address location will return 00H at the data outputs. Serial Programming Fuse: A programmable fuse is available to disable Serial Programming if the user needs maximum system security. The Serial Programming Fuse can be enabled/disabled in both the Parallel/Serial Programming Modes. The AT89S8253 is shipped with the Serial Programming Mode enabled. Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal verification of locations 030H and 031H, except that P3.6 and P3.7 must be pulled to a logic low. The values returned are as follows: (030H) = 1EH indicates manufactured by Atmel (031H) = 73H indicates AT89S8253
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22. Programming Interface
Every code byte in the Flash and EEPROM arrays can be written, and the entire array can be erased, by using the appropriate combination of control signals. The write operation cycle is selftimed and once initiated, will automatically time itself to completion. Most worldwide major programming vendors offer support for the Atmel AT89 microcontroller series. Please contact your local programming vendor for the appropriate software revision.
23. Serial Downloading
Both the code and data memory arrays can be programmed using the serial SPI bus while RST is pulled to VCC. The serial interface consists of pins SCK, MOSI (input) and MISO (output). After RST is set high, the Programming Enable instruction must be executed first before other operations can be executed. The Chip Erase operation turns the content of every memory location in both the Code and Data arrays into FFH. The code and data memory arrays have separate address spaces: 0000H to 2FFFH for code memory and 000H to 7FFH for data memory. Either an external system clock is supplied at pin XTAL1 or a crystal needs to be connected across pins XTAL1 and XTAL2. The maximum serial clock (SCK) frequency should be less than 1/16 of the crystal frequency. With a 24 MHz oscillator clock, the maximum SCK frequency is 1.5 MHz.
24. Serial Programming Algorithm
To program and verify the AT89S8253 in the serial programming mode, the following sequence is recommended: 1. Power-up sequence: a. Apply power between VCC and GND pins. b. Set RST pin to "H". If a crystal is not connected across pins XTAL1 and XTAL2, apply a 3 MHz to 24 MHz clock to XTAL1 pin and wait for at least 10 ms with RST pin high and P1.7 (SCK) low. 2. Enable serial programming by sending the Programming Enable serial instruction to pin MOSI/P1.5. The frequency of the shift clock supplied at pin SCK/P1.7 needs to be less than the CPU clock at XTAL1 divided by 16. 3. The code or data array is programmed one byte or one page at a time by supplying the address and data together with the appropriate Write instruction. The write cycle is selftimed and typically takes less than 4.0 ms at 5V. 4. Any memory location can be verified by using the Read instruction which returns the content at the selected address at serial output MISO/P1.6. 5. At the end of a programming session, RST can be set low to commence normal operation. Power-off sequence (if needed): 1. Set XTAL1 to "L" (if a crystal is not used). 2. Set RST to "L". 3. Turn VCC power off.
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25. Serial Programming Instruction
The Instruction Set for Serial Programming follows a 4-byte protocol and is shown in Table 25-1. Table 25-1.
Instruction Programming Enable Chip Erase Write Program Memory (Byte Mode) Read Program Memory (Byte Mode) Write Program Memory (Page Mode) Read Program Memory (Page Mode) Write Data Memory (Byte Mode) Read Data Memory (Byte Mode) Write Data Memory (Page Mode) Read Data Memory (Page Mode) Write User Fuses
Serial Programming Instruction Set
Instruction Format Byte 1 1010 1100 1010 1100 0100 0000 0010 0000 0101 0000 0011 0000 1100 0000 1010 0000 1101 0000 1011 0000 1010 1100 Byte 2 0101 0011 100x xxxx xx xx xx xx Byte 3 xxxx xxxx xxxx xxxx Byte 4 xxxx xxxx xxxx xxxx Byte n Operation Enable Serial Programming while RST is high Chip Erase both the 12K and 2K memory arrays Write data to Program Memory - Byte Mode Read data from Program Memory - Byte Mode Write data to Program Memory - Page Mode (64 bytes) Read data from Program Memory - Page Mode (64 bytes) Write data to Data Memory - Byte Mode Read data from Data Memory - Byte Mode Write data to Data Memory - Page Mode (32 bytes) Read data from Data Memory - Page Mode (32 bytes) Write user fuse bits (refer to next page for the fuse definitions)
FUSE4 FUSE3 FUSE2 FUSE1
A7 A6 A5 A4
A13 A12
A11 A10 A9 A8
A3 A2 A1 A0
D7 D6 D5 D4 D7 D6 D5 D4 D7 D6 D5 D4 D7 D6 D5 D4
A7 A6 A5 A4
A13 A12
A11 A10 A9 A8
A3 A2 A1 A0
A13 A12
A11 A10 A9 A8
A7 A6
00 0000 00 0000
Byte 0 ... Byte 63 Byte 0 ... Byte 63
D3 D2 D1 D0
A13 A12
A10 A9 A8
A7 A6 A5 A4
A10 A9 A8
A7 A6 A5 A4
A3 A2 A1 A0
A10 A9 A8
A7 A6 A5
xxxx x xxxx x 0001
0 0000 0 0000
Byte 0 ... Byte 31 Byte 0 ... Byte 31 xxxx xxxx
A10 A9 A8
0010 0001 Read User Fuses
xxxx xxxx
FUSE4 FUSE3 FUSE2 FUSE1
xxxx xxxx
xxxx xxxx
A7 A6 A5
xxxx
D3 D2 D1 D0
xxxx x
A3 A2 A1 A0
xxxx x
A11 A10 A9 A8
A7 A6
D3 D2 D1 D0
D3 D2 D1 D0
Read back status of user fuse bits
LB3 LB2 LB1
1010 1100 Write Lock Bits 0010 0100 Read Lock Bits
1110 0
xxxx xxxx
xxxx xxxx
Write the lock bits (write a "0" to lock) Read back current status of the lock bits (a programmed lock bit reads back as a "0")
A11 A10 A9 A8
A13 A12
D7 D6 D5 D4 D7 D6 D5 D4
Write User Sgn. Byte
A13 A12
A11 A10 A9 A8
Write User Sgn. Page Read User Sgn. Page Read ATMEL Sgn. Byte
0101 0010 0011 0010 0010 1000
xxxx xxxx xxxx xxxx xxxx xxxx
xxxx xxxx xxxx xxxx
A13 A12 A11 A10 A9 A8
Byte 0 ... Byte 63 Byte 0 ... Byte 63
D7 D6 D5 D4 D3 D2 D1 D0
xx
D3 D2 D1 D0
Read User Sgn. Byte
0010 0010
xxxx xxxx
xx
D3 D2 D1 D0
0100 0010
xxxx xxxx
xx
LB3 LB2 LB1
xxxx xxxx
xxxx xxxx
xxxx x
Read Signature Byte
After Reset signal is high, SCK should be low for at least 64 system clocks before it goes high to clock in the enable data bytes. No pulsing of Reset signal is necessary. SCK should be no faster than 1/16 of the system clock at pin XTAL1. For Page Read/Write, the data always starts from byte 0 to 31 or 63. After the command byte and upper address byte are latched, each byte thereafter is treated as data until all 32 or 64 bytes are shifted in/out. Then the next instruction will be ready to be decoded.
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26. Flash and EEPROM Parallel Programming Modes
ALE Mode RST
(1)
PSEN
EA
P3.3
P3.4
P3.5
P3.6
P3.7
Data I/O P0.7:0
Address P2.5:0, P1.7:0
Serial Prog. Modes Chip Erase Page Write Read Page Write Read
(3)(4)(6) (2)
H H 12K Code 12K Code 2K Data 2K Data Bit - 1 H H H H
h L L L L L
h 1.0 s 1.0 s H 1.0 s H 12V 12V 12V 12V 12V H L L L L L H L H L H H H L L L H H H H L H H H H X DI DO DI DO D0 = 0 X ADDR ADDR ADDR ADDR X X X X X X 0 - 3FH 0 - 3FH 0 - 3FH X X X X X X X X X X X
(3)(4)(5)
Write Lock Bits
(2)(4)
Bit - 2 Bit - 3 Bit - 1
H
L
1.0 s
12V
H
L
H
H
L
D1 = 0 D2 = 0 D0
Read Lock Bits
Bit - 2 Bit - 3
H
L
H
12V
H
H
H
L
L
D1 D2
Page Write Read Read
(3)(4)(5)
User Row User Row Sig. Row SerialPrgEn SerialPrgDis x2 ClockEn x2 ClockDis
H H H
L L L
1.0 s H H
12V 12V 12V
H L L
L L L
H H H
H L L
H H L
DI DO DO D0 = 0 D0 = 1 D1 = 0 D1 = 1
Fuse1
Fuse2 Write Fuse(2)(4)
Fuse3
Fuse4
Read Fuse
Notes:
1. 2. 3. 4. 5. 6.
See detailed timing for Serial Programming Mode. Internally timed for 8.0 ms. Internally timed for 8.0 ms. Programming begins 150 s (minimum) after the last write pulse. P3.0 is pulled low during programming to indicate RDY/BSY 1 to 64 bytes can be programmed at a time per page. 1 to 32 bytes can be programmed at a time per page.
3286C-MICRO-1/05
} } } }
H UsrRowPrgEn UsrRowPrgDis External Clock En Crystal Clock En SerialPrg (Fuse1) x2 Clock (Fuse2) UsrRow Prg (Fuse3) Clock Select (Fuse4) H
L
1.0 s
12V
L
H
H
L
H D2 = 0 D2 = 1 D3 = 0 D3 = 1 D0 D1
L
H
12V
H
H
H
L
H
D2
D2
X
39
Figure 26-1. Programming the Flash/EEPROM Memory (Parallel Mode)
VCC VCC
AT89S8253
A0 - A7 ADDR. 0000H/37FFH A8 - A13 P3.3 SEE FLASH PROGRAMMING MODES TABLE P3.4 P3.5 P3.6 P3.7 XTAL2 EA VPP ALE P1 P2.0 - P2.5 VCC P0 PGM DATA A0 - A7 ADDR. 0000H/37FFH A8 - A13
AT89S8253
P1 P2.0 - P2.5 P3.3 SEE FLASH PROGRAMMING MODES TABLE P3.4 P3.5 P3.6 P3.7 EA VPP VCC P0 PGM DATA
PROG
ALE
PROG
3-24 MHz P3.0 RDY/BSY (USE 10K PULLUP) VIH 3-12 MHz EXTERNAL CLOCK XTAL1 GND P3.0 RDY/BSY (USE 10K PULLUP) VIH
XTAL1 GND
RST PSEN
RST PSEN
Oscillator Bypass Fuse (Fuse4) Off
Oscillator Bypass Fuse (Fuse4) On
Figure 26-2. Verifying the Flash/EEPROM Memory (Parallel Mode)
VCC VCC
AT89S8253
ADDR. 0000H/37FFH A0 - A7 P1 P2.0 - P2.5 P3.3 P3.4 P3.5 P3.6 P3.7 XTAL2 EA VPP VCC P0 PGM DATA (USE 10K PULLUPS) VI H SEE FLASH PROGRAMMING MODES TABLE ADDR. 0000H/37FFH A0 - A7 P1
AT89S8253
VCC P0 PGM DATA (USE 10K PULLUPS) VI H
A8 - A13
A8 - A13
P2.0 - P2.5 P3.3 P3.4 P3.5 P3.6 P3.7
ALE
ALE
SEE FLASH PROGRAMMING MODES TABLE
EA
VPP
3-24 Mhz
XTAL1 GND
RST PSEN
VI H
3-12 MHz EXTERNAL CLOCK
XTAL1 GND
RST PSEN
VI H
Oscillator Bypass Fuse (Fuse4) Off
Oscillator Bypass Fuse (Fuse4) On
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Figure 26-3. Flash/EEPROM Serial Downloading
2.7V to 5.5V 2.7V to 5.5V
AT89S8253
VCC
AT89S8253
VCC
INSTRUCTION INPUT DATA OUTPUT CLOCK IN
P1.5/MOSI P1.6/MISO P1.7/SCK
INSTRUCTION INPUT DATA OUTPUT CLOCK IN
P1.5/MOSI P1.6/MISO P1.7/SCK
XTAL2
3-24 MHz
XTAL1 GND
RST
VIH
3-12 MHz EXTERNAL CLOCK
XTAL1 GND
RST
VIH
Oscillator Bypass Fuse (Fuse4) Off
Oscillator Bypass Fuse (Fuse4) On
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27. Flash Programming and Verification Characteristics - Parallel Mode
TA = 20C to 30C, VCC = 4.0V to 5.5V
Symbol VPP IPP 1/tCLCL tPWRUP tRHX tOSTL tHSTL tMSTP tASTP tDSTP tPGW tAHLD tDHLD tBLT tPHBL tWC tMHLD tVFY tPSTP tPHLD tPLX tXRL tPWRDN Notes: Parameter Programming Enable Voltage Programming Enable Current Oscillator Frequency Power On to RST High (1) RST High to XTAL Start Oscillator Settling Time High Voltage Settling Time Mode Setup to PROG Low Address Setup to PROG Low Data Setup to PROG Low PROG Width Address Hold after PROG Data Hold after PROG Byte Load Period PROG High to BUSY Low Write Cycle Time(2) Mode Hold After BUSY Low Address to Data Verify Valid PROG Setup to VPP High PROG Hold after VPP Low PROG Low to XTAL Halt XTAL Halt to RST Low RST Low to Power Off 1. Power On occurs once VCC reaches 2.4V. 2. 9 ms if Chip Erase. 10 10 1 1 1 10 1 3 10 10 10 10 1 1 1 1 1 1 1 150 256 4.5
Min Max Units
11.5
12.5 1.0 24
V mA MHz s s ms s s s s s s s s s ms s s s s s s s
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VCC tPWRUP RST tRHX XTAL 1 Running at 3 MHz tPLX tXRL tPWRDN PSEN tOSTL EA/VPP tPSTP ALE/PROG tMHLD tASTP P3.3...P3.7 tDSTP P1.0...P1.7 and P2.0...P2.5 ADDR0 ADDR1 tDHLD PORT 0 DATA0 DATA1 DATA0 tVFY DATA1 tAHLD tMSTP ADDR0 ADDR1 tHSTL tMSTP tPHLD tPGW tBLT P3.0 (RDY/BSY) tPHBL tWC
Figure 27-1. Flash/EEPROM Programming and Verification Waveforms - Parallel Mode
AT89S8253 [Preliminary]
43
28. Serial Downloading Waveforms (SPI Mode 1 --> CPOL = 0, CPHA = 1)
7 6 5 4 3 2 1 0
SERIAL DATA INPUT MOSI/P1.5 SERIAL DATA OUTPUT MISO/P1.6 SCK/P1.7
MSB LSB MSB LSB
29. Serial Programming Characteristics
Figure 29-1. Serial Programming Timing
Change Outputs Sample Inputs t SLSH t SHSL
SCK t OVSL MOSI t SHOX
MISO
t SHIV
Table 29-1.
Symbol 1/tCLCL tCLCL tSHSL tSLSH tOVSL tSHOX tSHIV tERASE tSWC
Serial Programming Characteristics, TA = -40C to 85C, VCC = 2.7V - 5.5V (Unless Otherwise Noted)
Parameter Oscillator Frequency Oscillator Period SCK Pulse Width High SCK Pulse Width Low MOSI Setup to SCK Low MOSI Hold after SCK Low SCK High to MISO Valid Chip Erase Instruction Cycle Time Serial Page Write Cycle Time Min 3 41.6 8 tCLCL 8 tCLCL tCLCL 2 tCLCL 10 16 32 9 4.5 Typ Max 24 33.3 Units MHz ns ns ns ns ns ns ms ms
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30. Absolute Maximum Ratings*
Operating Temperature.................................. -55C to +125C Storage Temperature ..................................... -65C to +150C Voltage on Any Pin with Respect to Ground .....................................-1.0V to +7.0V Maximum Operating Voltage ............................................ 6.6V DC Output Current...................................................... 15.0 mA *NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
31. DC Characteristics
The values shown in this table are valid for TA = -40C to 85C and VCC = 2.7 to 5.5V, unless otherwise noted
Symbol
VIL VIL1 VIH VIH1 VOL
Parameter
Input Low-voltage Input Low-voltage (EA) Input High-voltage Input High-voltage Output Low-voltage
(1)
Condition
(Except EA)
Min
-0.5V -0.5V
Max
0.2 VCC - 0.1V 0.2 VCC - 0.3V VCC + 0.5V VCC + 0.5V 0.4V
(Except XTAL1, RST) (XTAL1, RST) IOL = 10 mA, VCC = 4.0V, TA = 85C IOH = -60 A, TA = 85C IOH = -25 A, TA = 85C IOH = -10 A, TA = 85C IOH = -40 mA, TA = 85C IOH = -25 mA, TA = 85C IOH = -10 mA, TA = 85C VIN = 0.45V, VCC = 5.5V, TA = -40C VIN = 2V, VCC = 5.5V, TA = -40C 0.45V< VIN < VCC
0.2 VCC + 0.9V 0.7 VCC
VOH
Output High-voltage When Weak Pull Ups are Enabled (Ports 1, 2, 3, ALE, PSEN) Output High-voltage When Strong Pull Ups are Enabled (Port 0 in External Bus Mode, P1, 2, 3, ALE, PSEN) Logical 0 Input Current (Ports 1, 2, 3) Logical 1 to 0 Transition Current (Ports 1, 2, 3) Input Leakage Current (Port 0, EA) Reset Pull-down Resistor Pin Capacitance Power Supply Current
2.4V 0.75 VCC 0.9 VCC 2.4V 0.75 VCC 0.9 VCC -50 A -352 A 10 A 50 K 150 K 10 pF 25 mA 6.5 mA 100 A 40 A
VOH1
IIL ITL ILI RRST CIO
Test Freq. = 1 MHz, TA = 25C Active Mode, 12 MHz, VCC = 5.5V, TA = -40C Idle Mode, 12 MHz, VCC = 5.5V, TA = -40C
ICC Power-down Mode(2)
VCC = 5.5V, TA = -40C VCC = 4.0V, TA = -40C
Notes:
1. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL per port pin: 10 mA, Maximum IOL per 8-bit port:15 mA, Maximum total IOL for all output pins: 71 mA If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 2. Minimum VCC for Power-down is 2V.
45
3286C-MICRO-1/05
32. AC Characteristics
The values shown in this table are valid for TA = -40C to 85C and VCC = 2.7 to 5.5V, unless otherwise noted. Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other outputs = 80 pF.
32.1
External Program and Data Memory Characteristics
Variable Oscillator Parameter Oscillator Frequency ALE Pulse Width Address Valid to ALE Low Address Hold after ALE Low ALE Low to Valid Instruction In ALE Low to PSEN Low PSEN Pulse Width PSEN Low to Valid Instruction In Input Instruction Hold after PSEN Input Instruction Float after PSEN PSEN to Address Valid Address to Valid Instruction In PSEN Low to Address Float RD Pulse Width WR Pulse Width RD Low to Valid Data In Data Hold after RD Data Float after RD ALE Low to Valid Data In Address to Valid Data In ALE Low to RD or WR Low Address to RD or WR Low Data Valid to WR Transition Data Valid to WR High Data Hold after WR RD Low to Address Float RD or WR High to ALE High tCLCL - 10 3tCLCL - 24 4tCLCL - 12 2tCLCL - 24 8tCLCL - 24 2tCLCL - 24 2tCLCL + 10 tCLCL + 20 tCLCL + 20 2tCLCL - 20 8tCLCL - 50 9tCLCL - 50 3tCLCL 6tCLCL 6tCLCL 5tCLCL - 50 tCLCL - 4 5tCLCL - 50 20 -10 tCLCL - 20 tCLCL - 12 tCLCL 3tCLCL - 50 Min 0 2tCLCL - 12 tCLCL - 12 tCLCL - 16 4tCLCL - 50 Max 24 Units MHz ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns
Symbol 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tPXAV tAVIV tPLAZ tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tQVWH tWHQX tRLAZ tWHLH
46
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
33. External Program Memory Read Cycle
34. External Data Memory Read Cycle
47
3286C-MICRO-1/05
35. External Data Memory Write Cycle
36. External Clock Drive Waveforms
37. External Clock Drive
VCC = 2.7V to 5.5V Symbol 1/tCLCL tCLCL tCHCX tCLCX tCLCH tCHCL Parameter Oscillator Frequency Clock Period High Time Low Time Rise Time Fall Time Min 0 41.6 12 12 5 5 Max 24 Units MHz ns ns ns ns ns
48
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
38. Serial Port Timing: Shift Register Mode Test Conditions
The values in this table are valid for VCC = 2.7V to 5.5V and Load Capacitance = 80 pF.
Variable Oscillator Symbol tXLXL tQVXH tXHQX tXHDX tXHDV Parameter Serial Port Clock Cycle Time Output Data Setup to Clock Rising Edge Output Data Hold after Clock Rising Edge Input Data Hold after Clock Rising Edge Input Data Valid to Clock Rising Edge Min 12tCLCL -15 10tCLCL -15 2tCLCL -15 tCLCL 0 Max Units s ns ns ns ns
39. Shift Register Mode Timing Waveforms
40. AC Testing Input/Output Waveforms(1)
Note:
1. AC Inputs during testing are driven at VCC - 0.5V for a logic 1 and 0.45V for a logic 0. Timing measurements are made at VIH min. for a logic 1 and VIL max. for a logic 0.
41. Float Waveforms(1)
Note:
1. For timing purposes, a port pin is no longer floating when a 100 mV change from load voltage occurs. A port pin begins to float when a 100 mV change from the loaded VOH/VOL level occurs.
49
3286C-MICRO-1/05
42. ICC Test Condition, Active Mode, All Other Pins are Disconnected
VCC ICC RST VCC P0 EA (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS VCC
43. ICC Test Condition, Idle Mode, All Other Pins are Disconnected
VCC ICC RST VCC P0 EA (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS VCC
44. Clock Signal Waveform for ICC Tests in Active and Idle Modes, tCLCH = tCHCL = 5 ns
VCC - 0.5V 0.45V 0.7 VCC 0.2 VCC - 0.1V tCHCL tCHCX tCLCL tCHCX tCLCH
45. ICC Test Condition, Power-down Mode, All Other Pins are Disconnected, VCC = 2V to 5.5V
VCC ICC RST VCC P0 EA (NC) XTAL2 XTAL1 VSS VCC
50
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
46. ICC (Active Mode) Measurements
AT89S8253 I CC Active @ 25 C With Internal Clock Oscillator x1 Mode
4.00 3.50 3.00 2.50 2.00 1.50 1 2 3 4 5 6 7 8 9 10 11 12 3.0V 4.0V 5.0V
o
ICC A c t i v e (m A )
Frequency (MHz)
AT89S8253 I CC Active @ 90 C
With Internal Clock Oscillator x1 Mode
4.00
o
ICC A c t i v e (m A )
3.50 3.00 2.50 2.00 1.50 1 2 3 4 5 6 7 8 9 10 11 12 3.0V 4.0V 5.0V
Frequency (MHz)
51
3286C-MICRO-1/05
47. ICC (Idle Mode) Measurements
AT89S8253 I CC Idle vs. Frequency, T = 25C With Internal Clock Oscillator x1 Mode
3 2.5
ICC (m A )
2
1.5 1
Vcc=3V Vcc=4V Vcc=5v
0.5 0 0 5 10 15 20 25
Frequency (MHz)
48. ICC (Power Down Mode) Measurements
AT89S8253 I CC in Power-down
2.5 2 ICC Pwd (uA) 1.5 1 0.5 0 1 2 3 4 V CC (V) 5 6 7 0 deg C 25 deg C 90 deg C
52
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
49. Ordering Information
49.1 Standard Package
Power Supply Ordering Code AT89S8253-24AC AT89S8253-24JC AT89S8253-24PC AT89S8253-24SC AT89S8253-24AI AT89S8253-24JI AT89S8253-24PI AT89S8253-24SI Package 44A 44J 40P6 42PS6 44A 44J 40P6 42PS6 Operation Range Commercial (0C to 70C)
Speed (MHz)
2.7V to 5.5V 24 2.7V to 5.5V
Industrial (-40C to 85C)
49.2
Green Package Option (Pb/Halide-free)
Power Supply Ordering Code AT89S8253-24AU AT89S8253-24JU AT89S8253-24PU AT89S8253-24SU Package 44A 44J 40P6 42PS6 Operation Range Industrial (-40C to 85C)
Speed (MHz)
24
2.7V to 5.5V
Package Type 44A 44J 40P6 42PS6 44-lead, Thin Plastic Gull Wing Quad Flat Package (TQFP) 44-lead, Plastic J-leaded Chip Carrier (PLCC) 40-lead, 0.600" Wide, Plastic Dual Inline Package (PDIP) 42-lead, 0.600" Wide, Plastic Dual Inline Package (PDIP)
53
3286C-MICRO-1/05
50. Package Information
50.1 44A - TQFP
PIN 1 B
PIN 1 IDENTIFIER
e
E1
E
D1 D C
0~7 A1 L
COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL A A1 A2 D D1 E MIN - 0.05 0.95 11.75 9.90 11.75 9.90 0.30 0.09 0.45 NOM - - 1.00 12.00 10.00 12.00 10.00 - - - 0.80 TYP MAX 1.20 0.15 1.05 12.25 10.10 12.25 10.10 0.45 0.20 0.75 Note 2 Note 2 NOTE
A2
A
Notes:
1. This package conforms to JEDEC reference MS-026, Variation ACB. 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is 0.25 mm per side. Dimensions D1 and E1 are maximum plastic body size dimensions including mold mismatch. 3. Lead coplanarity is 0.10 mm maximum.
E1 B C L e
10/5/2001 2325 Orchard Parkway San Jose, CA 95131 TITLE 44A, 44-lead, 10 x 10 mm Body Size, 1.0 mm Body Thickness, 0.8 mm Lead Pitch, Thin Profile Plastic Quad Flat Package (TQFP) DRAWING NO. 44A REV. B
R
54
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
50.2 44J - PLCC
1.14(0.045) X 45
PIN NO. 1 IDENTIFIER
1.14(0.045) X 45 0.318(0.0125) 0.191(0.0075)
E1 B
E
B1
D2/E2
e D1 D A A2 A1
0.51(0.020)MAX 45 MAX (3X)
COMMON DIMENSIONS (Unit of Measure = mm) SYMBOL A A1 A2 D D1 E Notes: 1. This package conforms to JEDEC reference MS-018, Variation AC. 2. Dimensions D1 and E1 do not include mold protrusion. Allowable protrusion is .010"(0.254 mm) per side. Dimension D1 and E1 include mold mismatch and are measured at the extreme material condition at the upper or lower parting line. 3. Lead coplanarity is 0.004" (0.102 mm) maximum. E1 D2/E2 B B1 e MIN 4.191 2.286 0.508 17.399 16.510 17.399 16.510 14.986 0.660 0.330 NOM - - - - - - - - - - 1.270 TYP MAX 4.572 3.048 - 17.653 16.662 17.653 16.662 16.002 0.813 0.533 Note 2 Note 2 NOTE
10/04/01 2325 Orchard Parkway San Jose, CA 95131 TITLE 44J, 44-lead, Plastic J-leaded Chip Carrier (PLCC) DRAWING NO. 44J REV. B
R
55
3286C-MICRO-1/05
50.3
40P6 - PDIP
D
PIN 1
E1
A
SEATING PLANE
L B1 e E B
A1
C eB
0 ~ 15
REF
SYMBOL A A1 D E E1 B
COMMON DIMENSIONS (Unit of Measure = mm) MIN - 0.381 52.070 15.240 13.462 0.356 1.041 3.048 0.203 15.494 NOM - - - - - - - - - - 2.540 TYP MAX 4.826 - 52.578 15.875 13.970 0.559 1.651 3.556 0.381 17.526 Note 2 Note 2 NOTE
Notes:
1. This package conforms to JEDEC reference MS-011, Variation AC. 2. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0.25 mm (0.010").
B1 L C eB e
09/28/01 2325 Orchard Parkway San Jose, CA 95131 TITLE 40P6, 40-lead (0.600"/15.24 mm Wide) Plastic Dual Inline Package (PDIP) DRAWING NO. 40P6 REV. B
R
56
AT89S8253 [Preliminary]
3286C-MICRO-1/05
AT89S8253 [Preliminary]
50.4 42PS6 - PDIP
D
PIN 1
E1
A
SEATING PLANE
L B1 e E B
A1
C eB
0 ~ 15
REF
SYMBOL A A1 D E E1 B
COMMON DIMENSIONS (Unit of Measure = mm) MIN - 0.51 36.70 15.24 13.46 0.38 0.76 3.05 0.20 - NOM - - - - - - - - - - 1.78 TYP MAX 4.83 - 36.96 15.88 13.97 0.56 1.27 3.43 0.30 18.55 Note 2 Note 2 NOTE
Notes:
1. This package conforms to JEDEC reference MS-011, Variation AC. 2. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0.25 mm (0.010").
B1 L C eB e
11/6/03 2325 Orchard Parkway San Jose, CA 95131 TITLE 42PS6, 42-lead (0.600"/15.24 mm Wide) Plastic Dual Inline Package (PDIP) DRAWING NO. 42PS6 REV. A
R
57
3286C-MICRO-1/05
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3286C-MICRO-1/05 xM
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