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SCN68652AC2A44 Datasheet(PDF) 5 Page - NXP Semiconductors |
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SCN68652AC2A44 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 28 page  Philips Semiconductors Product specification SCN2652/SCN68652 Multi-protocol communications controller (MPCC) 1995 May 01 5 Table 1. Register Access REGISTERS NO. OF BITS DESCRIPTION* Addressable PCSAR Parameter control sync/ address register 16 PCSARH and PCR contain parameters common to the receiver and transmitter. PCSARL contains a programmable SYNC character (BCP) or secondary station address (BOP). PCR Parameter control register 8 RDSRH contains receiver status information. RDSR Receive data/status register 16 RDSRL = RxDB contains the received assembled character. TDSR Transmit data/status register 16 TDSRH contains transmitter command and status information. TDSRL = TxDB contains the character to be transmitted Non-Addressable CCSR Control character shift register 8 HSR Holding shift register 16 RxSR Receiver shift register 8 These registers are used for character assembly (CSSR TxSR Transmitter shift register 8 These registers are used for character assembly (CSSR, HSR, RxSR), disassembly (TxSR), and CRC RxCRC Receiver CRC accumulation register 16 ,), y ( ), accumulation/generation (RxCRC, TxCRC). TxCRC Transmitter CRC generation register 16 NOTES: *H = High byte – bits 15–8 L = Low byte – bits 7–0 Table 2. Error Control CHARACTER DESCRIPTION FCS Frame check sequence is transmitted/received as 16 bits following the last data character of a BOP message. The divisor is usually CRC–CCITT (X16 + X12 + X5 + 1) with dividend preset to 1’s but can be other wise determined by ECM. The inverted remainder is transmitter as the FCS. BCC Block check character is transmitted/received as two successive characters following the last data character of a BCP message. The polynomial is CRC–16 (X16 + X15 + X2 + 1) or CRC–CCITT with dividend preset to 0’s (as specified by ECM). The true remainder is transmitted as the BCC. Table 3. Special Characters OPERATION BIT PATTERN FUNCTION BOP FLAG 01111110 Frame message ABORT 11111111 generation Terminate communication 01111111 detection GA 01111111 Terminate loop mode repeater function Address (PCSARL)1 Secondary station address BCP SYNC (PCSARL) or (TxDB)2 generation Character synchronization NOTES: 1. ( ) = contents of. 2. For IDLE = 0 or 1 respectively. APA PCSAR PCR RDSR TDSR 15 PROTO 14 SS/GA 13 SAM 12 IDLE 11 E C M 10 98 S/AR 7 6 54 32 10 TxCL 15 14 13 12 11 RxCL 10 9 8 Tx CL E R x CL E RERR 15 A B C 14 13 ROR 12 RAB/ GA 11 REOM 10 9 8 RxDB RSOM TERR 15 NOT DEFINED 14 13 TGA 12 TABORT 11 TEOM 10 9 8 TxDB TSOM NOTE: Refer to Register Formats for mnemonics and description. SD00059 Figure 3. Short Form Register Bit Formats |
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