说明：  C8051F020 AD采样及串口测试程序，AD输入端子(J7)可输入8路AD(AIN0--AIN7)，另有1路可测量片内温度，9路采样值都通过串口（使用串口必须将JP3的1，2及3，4脚短路）发送出去，在串口调试助手上看观察其值。8路AD输入中AIN7可通过跳以器(JP1)“ADC”（1，2脚短接）与板上电位器相连，通过手动调VR1可以观察到电压值的变化。
(C8051F020 AD sampling and serial port test program, AD input terminal (J7) to enter the 8-channel AD (AIN0- AIN7), while a measurable way on-chip temperature, 9 Lu sampled values through serial port (using the serial port must be JP3 of 1,2 and 3,4 pin short-circuit) to send out the serial port debugging assistant point of view to observe its value. 8-channel AD input AIN7 can jump to device (JP1) " ADC" (1,2 feet shorter then) and the on-board potentiometer connected by manually adjusted the value of VR1 can be observed voltage changes.)