SCN68652 datasheet(8/28 Pages) PHILIPS

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Philips Semiconductors

Product specification

SCN2652/SCN68652

Multi-protocol communications controller (MPCC)

1995 May 01

ASSEMBLE CHARACTER

IN RxSR. ZERO DELETION,

ACCUMULATE CRC IF

SPECIFIED

INITIALIZE PCSAR, PCR

RxE

= 1?

RECEIVER

STATUS BIT 0

→ 1

EXCEPT RSOM

PROCESSOR

RxE = 1

FLAG

IN CCSR*

YES

* TEST MADE

EVERY RxC TIME

S/F = 1

FOR ONE RxC

BIT TIME

(1) OVERRUN (ROVRN)

CAUSES LOSS OF

SUBSEQUENT

CHARACTERS

IT 1st

CHARACTER

AFTER FLAG

SEC.

STATION

MODE

YES

SECONDARY

STATION

ADDRESS

CHARACTER

= PCSARL

YES

(PCSAR12 = 1)

YES

FLAG

IN CCSR*

YES – END OF MESSAGE

RxSR

→ RxDB

(PCSAR12 = 0)

START OF

MESSAGE

RxA = 1

RSOM = 1

FOR ONE

CHARACTER

TIME

RxDA = 1

(PROCESSOR

SHOULD

READ RxDB)

FLAG

IN CCSR*

YES

RxE

→ 0

YES

RXSA = 1

(PROCESSOR SHOULD

READ AND EXAMINE

RDSRH – REOM, RAB/GA,

ROVRN, ABC, RERR)

S/F = 1 FOR ONE RxC

BIT TIME

REOM = 1, RxA = 0

SD00061

Figure 6. BOP Receive

TRANSMITTER OPERATION

General

After the parameter control registers (PCSAR and PCR) have been

initialized, TxSO is held at mark until TSOM (TDSR8) is set and TxE

is raised. Then, transmitter operation depends on protocol mode.

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

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