SCN68661

Philips Semiconductors Product specification Enhanced programmable communications interface (EPCI) 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. PIN CONFIGURATIONS D2 D3 RxD GND D4 D5 D6 D7 1 2 3 4 5 6 7 8 DIP 28 27 26 25 24 23 22 21 20 19 18 17 16 15 D1 D0 VCC RxC/BKDET DTR RTS DSR RESET BRCLK TxD TxEMT/DSCHG CTS DCD TxRDY TxC/XSYNC 9 A1 10 CE 11 A0 12 R/W 13 RxRDY 14 FEATURES Synchronous operation – 5- to 8-bit characters plus ...