Asynchronous Communications Interface Adapter (acia)The WDC CMOS W65C51S 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 1/16 times
an external Clock rate. The Receiver baud rate may be
selected under program control to be either the Transmitter
rate or at 1/16 times the external Clock rate. The ACIA has
programmable word lengths of 5, 6, 7 or 8 bits; even, odd or
no parity; 1, 1 or 2 bit stops.
The ACIA is designed for maximum-programmed control
from the Microprocessor (MPU) to simplify hardware
implementation. Three separate Registers permit the MPU to
easily select the W65C51S operating modes and data
checking parameters and determine operational status. By Unkown
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