实现对C8051F020的2个串口的调试，与测试功能-Two serial ports on the C8051F020 debugging, and testing capabilities

此程序为C8051F020串口调试程序 非常简单就是向PC机发送4个数据对初学者很有帮助-This procedure is very simple C8051F020 serial debugger is sent to PC 4 data useful for beginners

C8051F020实现ADC采样芯片外的模拟电压，通过LCD显示，并通过串口发送到PC机-C8051F020 chip analog voltage ADC sampling outside, through the LCD display, and sent to the PC via the serial port