SCC2698B

The SCC2698B from NXP Semiconductors is a single-chip MOS-LSI communications device featuring eight full-duplex asynchronous receiver/transmitter channels. Fabricated with CMOS technology, it offers high density and low power consumption.

Each receiver and transmitter channel can operate at independently selected speeds, supporting 26 fixed baud rates from 50 to 38.4K baud, non-standard rates up to 115.2K baud, user-defined rates via a programmable counter/timer, or external clock inputs. The receiver is quadruple buffered to minimize data loss and reduce interrupt overhead. Handshaking capability (RTS/CTS) is provided to manage receiver buffer status.

This Octal UART supports programmable data formats including 5 to 8 data bits plus parity, with options for odd, even, or no parity, and 1, 1.5, or 2 stop bits. Error detection for parity, framing, and overrun is included, along with false start bit and line break detection. The device offers various programmable channel modes such as normal (full-duplex), automatic echo, local loopback, and remote loopback.

It features four multi-function programmable 16-bit counter/timers and four interrupt outputs with eight maskable interrupting conditions each. The SCC2698B is TTL compatible and operates from a single +5V power supply. It is an upwardly compatible version of the 2698A, with enhancements in PLCC packaging including receiver ready/FIFO full status outputs and transmitter empty status outputs on 16 multipurpose I/O pins.