说明：  c8051f020的应用程序,主要为对ADC0的应用,使用其内置的温度传感器读取其片内温度值,并可以设置模拟输入口检测电压值
(C8051F020 applications, mainly for ADC0 applications, using its built-in temperature sensor to read the chip temperature, and can set the analog input voltage value detection)