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SCN2652AC2A44 Datasheet(PDF) 8 Page - NXP Semiconductors |
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SCN2652AC2A44 Datasheet(HTML) 8 Page - NXP Semiconductors |
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8 / 22 page  Philips Semiconductors Product specification SCN2652/SCN68652 Multi-protocol communications controller (MPCC) 1995 May 01 8 ASSEMBLE CHARACTER IN RxSR. ZERO DELETION, ACCUMULATE CRC IF SPECIFIED A INITIALIZE PCSAR, PCR RxE = 1? RECEIVER STATUS BIT 0 → 1 EXCEPT RSOM ? PROCESSOR RxE = 1 NO FLAG IN CCSR* ? YES NO * TEST MADE EVERY RxC TIME NO S/F = 1 FOR ONE RxC BIT TIME (1) OVERRUN (ROVRN) CAUSES LOSS OF SUBSEQUENT CHARACTERS IS IT 1st CHARACTER AFTER FLAG ? NO SEC. STATION MODE ? YES SECONDARY STATION ADDRESS IS CHARACTER = PCSARL ? NO YES YES (PCSAR12 = 1) YES NO FLAG IN CCSR* ? YES – END OF MESSAGE NO RxSR → RxDB NO (PCSAR12 = 0) START OF MESSAGE RxA = 1 RSOM = 1 FOR ONE CHARACTER TIME RxDA = 1 (PROCESSOR SHOULD READ RxDB) FLAG IN CCSR* ? YES YES RxE → 0 ? NO A YES RXSA = 1 (PROCESSOR SHOULD READ AND EXAMINE RDSRH – REOM, RAB/GA, ROVRN, ABC, RERR) S/F = 1 FOR ONE RxC BIT TIME REOM = 1, RxA = 0 SD00061 Figure 6. BOP Receive TRANSMITTER OPERATION General After the parameter control registers (PCSAR and PCR) have been initialized, TxSO is held at mark until TSOM (TDSR8) is set and TxE is raised. Then, transmitter operation depends on protocol mode. TxBOP Operation Transmitter operation for BOP is shown in Figure 8. A FLAG is sent after the processor sets the Transmit Start of Message bit (TSOM) and raises TxE. The FLAG is used to synchronize the message that follows. TxA will also be asserted. When TxBE is asserted by the |
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