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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.

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

? 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

APPLICATIONS

? Intelligent terminals

? Network processors

? Front-end processors

? Remote data concentrators

? Computer-to-computer links

? Serial peripherals

? BISYNC adaptors