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SCN2652

Multi-protocol communications controller(MPCC)

Philips Electronics 

Philips Semiconductors

Multi-protocol communications controller (MPCC)

Product specification

SCN2652/SCN68652

PROCESSOR

RxE = 1

S/F = 1 FOR ONE

RxC BIT TIME

RxA = 1

RxDA = 1

(PROCESSOR

SHOULD READ

RxDB)

RxSA = 1

(PROCESSOR SHOULD

READ AND EXAMINE

RDSRH – ROVRN,

RERR (IF VRC

SPECIFIED)

RxE = 0

WHEN LAST

CHARACTER HAS

BEEN SERVICED

INITIALIZE PCSAR, PCR

A

RxE

= 1?

YES

SYNC

DETECT1

IN CCSR?

YES

SYNC

DETECT2

IN CCSR?

YES

SYNC

DETECT IN

CCSR?

NO

NO

NO

NO

YES

ASSEMBLE CHARACTER

IN RxSR, STRIP VRC IF

SPECIFIED, ACCUMULATE

CRC IF SPECIFIED

STRIP

YES

SYNC (PCSAR13)

= 1?

NO

(1) SYNCs ARE ASSEMBLED

(2) OVERRUN (ROVRN) CAUSES

LOSS OF SUBSEQUENT

CHARACTERS

RxSR → RxDB

ANY

RECEIVER

NO

STATUS BIT

0→1

?

YES

RxE

NO

= 0?

YES

A

NOTES:

1. Test made every RxC time.

2. Test made on Rx character boundary.

Figure 7. BCP Receive

SD00062

1995 May 01

10

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