这是C8051F040单片机开发的一个串口通信程序，通过串口调试测试程序正确，可以直接拿来用，对使用C8051F040单片机开发者具有一定的参考价值。-This is a C8051F040 microcontroller serial communication program developed by serial debug test procedure correctly, you can directly make use of them, on the C8051F040 microcontroller developers to use a certain reference value.