WDC 65C51

The CMOS W65C51 Asynchronous Communications Interface Adapter (ACIA) provides an easily implemented, program controlled interface between microprocessor based systems and serial communication data sets and modems.

It is produced by Western Design Center (WDC) and is a drop-in replacement for the MOS Technology 6551.

The ACIA has an internal baud rate generator, eliminating the need for multiple component support circuits.

The ACIA is designed for maximum programmed control from the microprocessor (MPU) to simplify hardware implementation.

The status register indicates the status of the IRQ, DSR and DCD lines, transmitter and receiver data Registers, and overrun, framing and parity error conditions.