R65C51
DESCRIPTION
The Rockwell CMOS R65C51 Asynchronous munications Interface Adapter (ACIA) provides an easily implemented, program controlled interface between 8-bit microprocessor-based systems and serial munication data sets and modems. The ACIA has an internal baud rate generator. This feature eliminates the need for multiple ponent 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. The ACIA has programmable word lengths of 5, 6, 7, or 8 bits; even, odd, or no parity; 1, 1'12, or 2 stop bits. The ACIA is designed for maximum programmed the microprocessor (MPU), to simplify hardware tion. Three separate registers permit the MPU to the R65C51’s operating modes and’ data...
