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| Microcontrollers ApNote APXXXX01.EXE available AP1612 o additional file Bootstrap Loader - IDB / Half Duplex Some members of the C166 family do not support half duplex mode directly during bootstrap loader mode. Mariutti / Siemens HL MCB PD Semiconductor Group 03.97, Rel. 01 Bootstrap Loader IDB / Half Duplex Identification Byte (IDB) / Half Duplex Mode No Half Duplex Mode support Some members of the C166 family do not support half duplex mode directly during bootstrap loader mode. The problem is that the receiver of the ASC0 is enabled during transmission of the IDB from the ASC0 to the host. Because of the connection of TxD0 and RxD0 (done by external hard ware in half duplex mode) the IDB is received as the first byte of the 32bytes which are expected from the bootstrap loader sent by the host. In despite of this behaviour the half duplex mode can be used with the devices of the C166 family. It is only necessary to complete the IDB to an instruction (IDB instruction). This can be done in the following way: IDB instructions: Chip C165 C166 C167 IDB B5h 55h A5h additional bytes 4Ah, B5h, B5h RR, MM, MM 5Ah, A5h, A5h IDB instruction EINIT XORB op1, op2 DISWDT This workaround reduces the number of usable bytes for a preloader from 32bytes to 28bytes because 4bytes are necessary for the 'IDB instruction'. Half Duplex Mode support For the C166 family devices which support half duplex mode the described workaround is not necessary (not allowed), because the receiver of the ASC0 is disabled during transmission of the IDB. Therefore it is possible to use half duplex mode. C166 Bootstrap Loader versions: Chip Step IDB Activation Half Duplex support No No No No Yes No Yes Yes Yes Yes No Yes 80C166/83C166 88C166 SAx-C167 SAx-C167 SAx-C167 SAx-C167CW SAx-C167S-4RM SAx-C167SR-LM SAx-C167CR-LM SAx-C167CR-16F SAx-C165 SAx-C165 since CB since ES1-BA AC AD since BA all Steps all Steps all Steps all Steps all Steps AA to BB since CA 55h 55h A5h A5h C5h A5h C5h C5h C5h C5h B5h B5h ALE+NMI# ALE+NMI# P0L.3 + NMI# (see Errata Sheet) P0L.4 P0L.4 P0L.4 P0L.4 P0L.4 P0L.4 P0L.4 P0L.4 P0L.4 Semiconductor Group 2 of 2 AP1612 03.97 |
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