SCN2652AC2N40 查看數據表（PDF） - Philips Electronics
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SCN2652AC2N40 Datasheet PDF : 28 Pages
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Philips Semiconductors
Multi-protocol communications controller (MPCC)
Product specification
SCN2652/SCN68652
TIMING DIAGRAMS (Continued)
RxC
RECEIVE END OF MESSAGE
RxDA
RxSA1
DBEN
(8-BIT)
S/F
READ
DATA
READ
STATUS
RxE2
RxA3
NOTES:
1. At the end of a BOP message, RxSA goes high when FLAG detection (S/F 1) forces REOm to be set. Processor should read the last data character (RDSRL) and status (RDSRH)
which resets RxDA and RxSA respectively. For BCP end of message, RxSA may not be set and S/F = 0. The processor should read the last data character and status.
2. RxE must be dropped for BCP with non-contiguous messages. It may be left on at the end of a BOP message (see BOP Receive Operation).
3. RxA is reset relative to the falling edge of RxC after the closing FLAG of a BOP message (REOM = 1 and RxSA active.) or when RxE is dropped.
SD00072
Figure 17. Timing Diagrams (cont.)
TYPICAL APPLICATIONS
SCN2652 MPCC MICROPROCESSOR INTERFACE
RESET
CLOCK
Φ
8-BIT
µP
DATA BUS
ADDRESS CONTROL
RESET
TS BUFFER
STATUS
TxC
LR
DB0–DB7
A2–A0, R/W DBEN CE
MPCC
SCN2652
“1”
BYTE
RxC
LR
TxSO
LD
RxSI
LR
SYNCHRO-
NOUS
MODEM
MODEM
CONTROL
LOGIC
RxE TxE
DCD CTS
RTS, CTS,
DTR, DSR,
DCD
NOTES:
1. Possible µP interrupt requests are: RxDA RxSA TxBE TxU
2. Other SCN2652 status signals and possible uses are S F line idle indicator, frame delimiter. RxA handshake on RxE, line turn around control. TxA handshake on TxE, line turn
around control.
3. Line drivers/receivers (LD/LR) convert EIA to TTL voltages and vice-versa.
4. RTS should be dropped after the CRC (BCP) or FLAG (BOP) has been transmitted. This forces CTS low and TxE low.
5. Corresponding high and low order bits of DB must be OR tied.
SD00073
Figure 18. Typical Applications
1995 May 01
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