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R65C51 ASYNCHRONOUS COMMUNICATIONS
PRELiMlNARY
DESCRIPTION
The Rockwell CMOS R65C51 Asynchronous Communications Interface Adapter (ACIA) provides an easily implemented, program controlled interface between 8-bit microprocessor-based systems and serial communication data sets and modems. The ACIA has an internal baud rate generator. This feature eliminates the need for multiple component support circuits, a crystal being the only other part required. The Transmitter baud rate can be selected under program control to be either 1 of 15 different rates from 50 to 19,200 baud, or at l/16 times an external clock rate. The Receiver baud rate may be selected under program control to be either the Transmitter rate, or at l/16 times the external clock rate.
R65C51 Datasheet
