SCN2652 データシートの表示（PDF） - Philips Electronics

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SCN2652

Multi-protocol communications controller(MPCC)

Philips Electronics 

Philips Semiconductors

Multi-protocol communications controller (MPCC)

Product specification

SCN2652/SCN68652

PROCESSOR

INITIALIZE PCSAR, PCR

A

RxE = 1

RxE

= 1?

NO

YES

FLAG

IN CCSR*

?

* TEST MADE

EVERY RxC TIME

NO

YES

S/F = 1

FOR ONE RxC

BIT TIME

FLAG

IN CCSR*

?

NO

YES

ASSEMBLE CHARACTER

IN RxSR. ZERO DELETION,

ACCUMULATE CRC IF

SPECIFIED

(1) OVERRUN (ROVRN)

CAUSES LOSS OF

SUBSEQUENT

CHARACTERS

NO

RxA = 1

RSOM = 1

FOR ONE

CHARACTER

TIME

START OF

MESSAGE

IS

IT 1st

CHARACTER

AFTER FLAG

?

YES

SECONDARY

STATION

ADDRESS

SEC.

IS

NO

STATION

CHARACTER

MODE

?

YES

= PCSARL

(PCSAR12 = 1)

?

NO

(PCSAR12 = 0)

YES

RxSR → RxDB

RxDA = 1

(PROCESSOR

SHOULD

READ RxDB)

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

RECEIVER

STATUS BIT 0 → 1

EXCEPT RSOM

NO

?

YES

FLAG

IN CCSR*

?

NO

YES – END OF MESSAGE

Figure 6. BOP Receive

RxE → 0

? NO

YES

A

SD00061

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

1995 May 01

8

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