Motorola MPC8260 - Manual (Page 651)

MOTOROLA Chapter 22. SCC BISYNC Mode 22-19
Part IV. Communications Processor Module
13. Write BSYNC with 0x8033, assuming a SYNC value of 0x33.
14. Write DSR with 0x3333.
15. Write BDLE with 0x8055, assuming a DLE value of 0x55.
16. Write CHARACTER1 with 0x6077, assuming ETX = 0x77.
17. Write CHARACTER2Ð8 with 0x8000. They are not used.
18. Write RCCM with 0xE0FF. It is not used.
19. Initialize the RxBD and assume the data buffer is at 0x00001000 in main memory.
Then write 0xB000 to RxBD[Status and Control], 0x0000 to RxBD[Data Length]
(optional), and 0x00001000 to RxBD[Buffer Pointer].
20. Initialize the TxBD and assume the Tx data buffer is at 0x00002000 in main memory
and contains Þve 8-bit characters. Then write 0xBD20 to TxBD[Status and Control]
0x0005 to TxBD[Data Length], and 0x00002000 to TxBD[Buffer Pointer]. Note
that ETX character should be written at the end of userÕs data.
21. Write 0xFFFF to SCCE to clear any previous events.
22. Write 0x0013 to SCCM to enable the TXE, TXB, and RXB interrupts.
23. Write 0x0040_0000 to the SIU interrupt mask register low (SIMR_L) so the SMC1
can generate a system interrupt. Initialize SIU interrupt pending register low
(SIPNR_L) by writing 0xFFFF_FFFF to it.
24. Write 0x0000002C to GSMR_H2 to conÞgure a small receive FIFO width.
25. Write 0x00000008 to GSMR_L2 to conÞgure CTS and CD to automatically control
transmission and reception (DIAG bits) and the BISYNC mode. Notice that the
transmitter (ENT) and receiver (ENR) are not yet enabled.
26. Set PSMR to 0x0600 to conÞgure CRC16, CRC checking on receive, and normal
operation (not transparent).
27. Write 0x00000038 to GSMR_L2 to enable the SCC2 transmitter and receiver. This
additional write ensures that ENT and ENR are enabled last.
Write 0x00000038 to GSMR_L2 to enable the SCC2 transmitter and receiver. This
additional write ensures that ENT and ENR are enabled last. After 5 bytes are sent, the
TxBD is closed. The buffer is closed after 16 bytes are received. Any received data beyond
16 bytes causes a busy (out-of-buffers) condition since only one RxBD is prepared.