scn68652 NXP Semiconductors, scn68652 Datasheet - Page 20

• Manufacturer Part Number: scn68652
• Description: Multi-protocol Communications Controller Mpcc
• Manufacturer: NXP Semiconductors

Philips Semiconductors
TIMING DIAGRAMS
1995 May 01
Multi-protocol communications controller (MPCC)
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-
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
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
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.
ing assertion of the TSOM command.
the TxDB.
(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).
RxDA
DBEN
S/F
RxC
RxA
RxE
2
3
(Continued)
1st CHAR READY
TO BE READ
DBEN
TxU
TxC
1
2
1
1st CHAR READ
Figure 15. Timing Diagrams (cont.)
Figure 16. Timing Diagrams (cont.)
RECEIVE – START OF MESSAGE
TRANSMIT UNDERRUN
SET TSOM
20
2nd CHAR READY
TO BE READ
2nd CHAR READ
SCN2652/SCN68652
Product specification
SD00070
SD00071