说明，单片机，这是一个使用单片机串行通信口通过RS232总线与PC进行通信的测试程序,串行中断接收,通信方式3，无需扩展-Descr iption of the microcontroller, which is a Serial communication port via RS232 bus with the PC to communicate test procedures, the serial interrupt reception means of communication without the need to expand