Philips Semiconductors

Product specification

SCN2661/SCN68661

Enhanced programmable communications

interface (EPCI)

1

1994 Apr 27

853-1070 12793

DESCRIPTION

The Philips Semiconductors SCN2661 EPCI is a universal

synchronous/asynchronous data communications controller chip

that is an enhanced version of the SCN2651. It interfaces easily to

all 8-bit and 16-bit microprocessors and may be used in a polled or

interrupt driven system environment. The SCN2661 accepts

programmed instructions from the microprocessor while supporting

many serial data communications disciplines —synchronous and

asynchronous — in the full- or half-duplex mode. Special support

for BISYNC is provided.

The EPCI serializes parallel data characters received from the

microprocessor for transmission. Simultaneously, it can receive

serial data and convert it into parallel data characters for input to the

microcomputer.

The SCN2661 contains a baud rate generator which can be

programmed to either accept an external clock or to generate

internal transmit or receive clocks. Sixteen different baud rates can

be selected under program control when operating in the internal

clock mode. Each version of the EPCI (A, B, C) has a different set

of baud rates.

FEATURES

– 5- to 8-bit characters plus parity

– Single or double SYN operation

– Internal or external character synchronization

– Transparent or non-transparent mode

– Transparent mode DLE stuffing (Tx) and detection (Rx)

– Automatic SYN or DLE-SYN insertion SYN, DLE and DLESYN

stripping

– Odd, even, or no parity

– Local or remote maintenance loopback mode

– Baud rate: DC to 1Mbps (1X clock)

– 5- to 8-bit characters plus parity

– 1, 1-1/2 or 2 stop bits transmitted

– Odd, even, or no parity

– Parity, overrun and framing error detection

– Line break detection and generation

– False start bit detection

– Automatic serial echo mode (echoplex)

– Local or remote maintenance loopback mode

– Baud rate: DC to 1Mbps

(1X clock)

DC to 62.5kbps (16X clock)

DC to 15.625kbps

(64X clock)

OTHER FEATURES

PIN CONFIGURATIONS

D1

D0

VCC

RxC/BKDET

DTR

RTS

DSR

RESET

BRCLK

TxD

TxEMT/DSCHG

CTS

DCD

TxRDY

RxRDY

R/W

A0

CE

A1

TxC/XSYNC

D7

D6

D5

D4

GND

RxD

D3

D2

DIP

PLCC

INDEX

CORNER

TOP VIEW

NOTE:

Pin Functions the same as 28-pin DIP.

28

27

26

25

24

23

22

21

20

19

18

17

16

15

1

2

3

4

5

6

7

8

9

10

11

12

13

14

26

25

19

18

12

11

5

4

1

SD00077

APPLICATIONS