利用MCS-51汇编语言实现的单片机通信程序，包括利用P1端口设定信号发送和接收，利用串口实现收发通信，单片机和主机通信等等。-Use of MCS-51 microcontroller assembly language communication program, including the use of P1 port setting signals to send and receive, send and receive communications using the serial