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SCN2661

Enhanced programmable communications interface (EPCI)

Philips Electronics 

Philips Semiconductors

Enhanced programmable communications

interface (EPCI)

Product specification

SCN2661/SCN68661

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

• Synchronous operation

– 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)

• Asynchronous operation

– 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

• Internal or external baud rate clock

• 3 baud rate sets

• 16 internal rates for each set

• Double-buffered transmitter and receiver

PIN CONFIGURATIONS

D2 1

28 D1

D3 2

27 D0

RxD 3

GND 4

26 VCC

25 RxC/BKDET

D4 5

24 DTR

D5 6

23 RTS

D6 7

22 DSR

DIP

D7 8

21 RESET

TxC/XSYNC 9

20 BRCLK

A1 10

19 TxD

CE 11

18 TxEMT/DSCHG

A0 12

17 CTS

R/W 13

16 DCD

RxRDY 14

15 TxRDY

INDEX

CORNER

4

1

26

5

25

PLCC

11

19

12

18

TOP VIEW

NOTE:

Pin Functions the same as 28-pin DIP.

• Dynamic character length switching

• Full- or half-duplex operation

• TTL compatible inputs and outputs

• RxC and TxC pins are short-circuit protected

• Single +5V power supply

• No system clock required

SD00077

APPLICATIONS

• Intelligent terminals

• Network processors

• Front-end processors

• Remote data concentrators

• Computer-to-computer links

• Serial peripherals

• BISYNC adaptors

1994 Apr 27

1

853-1070 12793

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