C8051F带通信协议的串口通信通信程序，上位机发送0xAA，单片机收到后反馈0xBB，通信开始。通信结束后发送0xCC。,C8051F serial communication with a communication protocol of the communication program, host computer to send 0xAA, SCM receipt feedback 0xBB, communication began. Communications sent after the end of 0xCC.