june 1998 1/3 this is preliminary information on a new product in development or undergoing evaluation. details are subject to change without notice. rev. 1.5 st7277 8-bit usb mcu for monitors with up to 60k rom, 2k ram, adc, timer, infra red, sync, pwm/brm, ddc/dma, i 2 c & sci product preview n user rom: up to 60 kbytes n data ram: up to 2 kbytes (256 bytes stack) n 8 mhz maximum internal clock frequency in fast mode, 4 mhz in normal mode n run, wait and halt cpu modes n ram retention mode n sync processor for mode recognition, power management and composite video blanking, clamping and free-running frequency generation. C corrector mode C analyzer mode n usb (universal serial bus) for monitor function with 2 endpoints C integrated 3.3v voltage regulator C integrated transceiver C suspend and resume operations n fast i 2 c multi master interface n ddc bus interface fully compliant with ddc1, 2b, 2b+, 2ab, 2bi standards n 32 i/o lines C 8 open drain i/os with high current capacity (10 ma) on port a C 5 lines programmable as interrupt inputs n 16-bit timer with 2 input captures and 2 output compare functions (with 1 output pin) n 8-bit analog to digital converter with 8 channels on port b n 8 10-bit pwm/brm digital to analog outputs n one 12-bit pwm/brm digital to analog output n asynchronous serial communications interface n infra red controller n master reset and power on/off reset 1 n programmable watchdog for system reliability n 56-pin shrink dual in line plastic package or 64- pin plastic quad flat pack n fully static operation n 0 to + 70 o c operating temperature range n 4.0v to 5.5v supply operating range n 24 mhz quartz oscillator n 63 basic instructions/17 main address modes n 8x8 unsigned multiply instruction n true bit manipulation n versatile development tools (dos and windows) including assembler, linker, c- compiler, archiver, source level debugger, and hardware emulator note 1 : power on/off reset not implemented in this revision. pqfp64 psdip56 contact your nearest sales office for full details 1
2/3 st7277 1 general description 1.1 introduction the st7277 is a hcmos microcontroller unit (mcu) from the st7 family with dedicated periph- erals for monitor applications. it is based around an industry standard 8-bit core and offers an enhanced instruction set. the proc- essor runs with an external clock at 24 mhz with a 5v supply. due to the fully static design of this de- vice, operation down to dc is possible. under soft- ware control the st7277 can be placed in wait or halt mode thus reducing power consumption. the enhanced instruction set and addressing modes afford real programming potential. in addition to standard 8-bit data management the st7 features true bit manipulation, 8x8 unsigned multiplication and indirect addressing modes. the device includes an on-chip oscillator, cpu, sync processor for video timing & vfback analy- sis, up to 60k rom, up to 2k ram, usb/dma, i/o, a timer with 2 input captures and 2 output compares, an 8-channel analog to digital convert- er, ddc/dma, i 2 c multi master, sci serial com- munications interface, watchdog reset, an infra red control preprocessor, and one 12-bit and eight 10-bit pwm/brm outputs for analog dc con- trol of external functions. figure 1. st7277 block diagram address and data bus v ss oscin oscout reset adc usb sie port c i 2 c port d ddc dac (pwm) osc v dd ram port b port a vr02120c pa0-pa6 pb1-pb7/ain1-ain7 usbv cc usbdp usbdm usggnd pc0/ocmp/hfback pc1/hsynci2 pc2/rx/scld pc3/sdad pc4/scli pc5/sdai pc6/rdi pc7/tdo pd1/hsynco pd3/itc pd4/itb pd5/ita pd6/clampout power supply da0, da1-da8 pb0/vfback/ain0 usb dma 8-bit core alu control watchdog mode selection : 3 rom/otp/eprom up to 60k bytes up to 2k bytes hsynci1 vsynci1 infra-red irin sync processor pd7/vsynci2 pd0/csynci pd2/vsynco pa7/blankout sci timer v ssa v dda
3/3 st7277 1.2 device summary information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without the express written approval of stmicroele ctronics. the st logo is a registered trademark of stmicroelectronics ? 1998 stmicroelectronics - all rights reserved. purchase of i 2 c components by stmicroelectronics conveys a license under the philips i 2 c patent. rights to use these components in an i 2 c system is granted provided that the system conforms to the i 2 c standard specification as defined by philips. stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco - the neth erlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. psdip56 st72771n9b1 st72771n6b1 st72771n5b1 st72771n4b1 pqfp64 st72771r9q1 st72771r6q1 st72771r5q1 st72771r4q1 rom (bytes) 60k 32k 24k 16k ram (bytes) 2k 1k 768 512 adc 8 channels 8 channels 8 channels 8 channels 16-bit timer 1 1 1 1 i2c bus one multimaster one multimaster one multimaster one multimaster ddc/dma yes yes yes yes sync processor yes yes yes yes pwm 999 9 i/o 32 32 32 32 usb yes yes yes yes ir yes yes yes yes sci yes yes yes yes eprom device st72e771n9d1 (csdip56) or st72e771r9g1 (cqfp64)
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