For microcontroller applications which require more than one serial port, the 83C51FA Programmable Counter Array (PCA) can implement additional half-duplex serial ports. If the on-chip UART is being used as an inter-processor link, the PCA can be used to interface the 83C51FA to additional asynchronous lines. This application uses several different Compare/Capture modes available on the PCA to receive or transmit bytes of data. It is assumed the reader is familiar the PCA and ASM51. For more information on the PCA refer to the ``Hardware Description of the 83C51FA'' chapter in the Embedded Controller Handbook (Order No. 210918).
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