scn68652 NXP Semiconductors, scn68652 Datasheet - Page 8

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

Philips Semiconductors
TRANSMITTER OPERATION
General
After the parameter control registers (PCSAR and PCR) have been
initialized, TxSO is held at mark until TSOM (TDSR
is raised. Then, transmitter operation depends on protocol mode.
1995 May 01
Multi-protocol communications controller (MPCC)
(PROCESSOR
RDSR
CHARACTER
READ RxDB)
(PROCESSOR SHOULD
PROCESSOR
RSOM = 1
FOR ONE RxC
FOR ONE
S/F = 1 FOR ONE RxC
RxDA = 1
READ AND EXAMINE
ROVRN, ABC, RERR)
SHOULD
H
RxA = 1
REOM = 1, RxA = 0
– REOM, RAB/GA,
TIME
BIT TIME
S/F = 1
RxE = 1
RXSA = 1
START OF
MESSAGE
BIT TIME
8
) is set and TxE
NO
IN RxSR. ZERO DELETION,
ASSEMBLE CHARACTER
INITIALIZE PCSAR, PCR
ACCUMULATE CRC IF
Figure 6. BOP Receive
STATUS BIT 0
RxSR
EXCEPT RSOM
CHARACTER
AFTER FLAG
RECEIVER
IN CCSR*
IN CCSR*
SPECIFIED
IN CCSR*
STATION
FLAG
FLAG
FLAG
MODE
= 1?
RxE
IT 1st
SEC.
?
?
?
?
IS
?
?
(PCSAR
RxDB
NO
YES
YES
YES – END OF MESSAGE
8
YES
YES
NO
1
(PCSAR
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
12
SECONDARY
STATION
ADDRESS
= 0)
YES
YES
NO
NO
NO
NO
12
= 1)
(1) OVERRUN (ROVRN)
CAUSES LOSS OF
SUBSEQUENT
CHARACTERS
EVERY RxC TIME
CHARACTER
* TEST MADE
= PCSAR
A
IS
?
YES
L
NO
SCN2652/SCN68652
RxE
A
?
SD00061
YES
0
NO
Product specification