可编程计数器阵列83C51FA在不同的比较 捕捉模式实现串口

CONTENTS PAGE
Introduction  1
Variables  1
Initialization  3
Receive Routine  3
Transmit Routine  7
Conclusion  8
APPENDIX  A-1
For microcontroller applications which require more
than one serial port, the 83C51FA Programmable
Counter Array (PCA) can implement additional halfduplex
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).