SCN2652 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

生产厂家

SCN2652

Multi-protocol communications controller(MPCC)

Philips Electronics 

Philips Semiconductors

Multi-protocol communications controller (MPCC)

Product specification

SCN2652/SCN68652

TIMING DIAGRAMS (Continued)

TRANSMIT UNDERRUN

TxC

TxU1

DBEN2

SET TSOM

NOTES:

1. TxU goes active relative to TxC falling edge if TxBE has not been serviced after n-1/2 TxC times (where n = transmit character length). TxU is reset on the TxC falling edge follow-

ing assertion of the TSOM command.

2. An underrun will occur at the next character boundary if TEOM is reset and the transmitter remains enabled, unless the TSOM command is asserted or a character is loaded into

the TxDB.

SD00070

Figure 15. Timing Diagrams (cont.)

RECEIVE – START OF MESSAGE

RxC

1

RxA

1st CHAR READY

TO BE READ

RxDA2

DBEN

1st CHAR READ

2nd CHAR READY

TO BE READ

2nd CHAR READ

S/F3

RxE

NOTES:

1. RxA goes high relative to falling edge of RxC when RxE is high and: a. A data character following two SYNC’s is in RxDB (BCP mode). b. Character following FLAG is in RxDB

(BOP primary station mode). c. Character following FLAG is in RxDB and character matches the secondary station address or all parties address (BOP secondary station mode).

2. RxDA goes high on RxC falling edge when a character in RxDB is ready to be read. It comes up before RxSA and goes low on the falling edge of DBEN when RxDB is read.

3. S/F goes high relative to rising edge of RxC anytime a SYNC (BCP) or FLAG (BOP) is detected.

SD00071

Figure 16. Timing Diagrams (cont.)

1995 May 01

20

Share Link: