用C8051f020制作的电源用到了内部的AD，DA，外接了LCD12864和按键键盘，能区别短时间按键，长时间按键。适合电源使用。-With the use of the power supply C8051f020 make internal AD, DA, external the LCD12864 and key keyboard, can distinguish a short time key, long time button. Suitable for power use.

C51源码.其内文件包含spi，smbus等代码。ad，da代码。-c51 keil code .The mcu is c8051f020.jking

C8051f020 AD，DA应用及电源按键程序-C8051f020 AD, DA application and the power button program

本文件是c8051f020单片机的DA测试程序，能够实现模拟量输出-This document is c8051f020 SCM DA test procedures, enabling analog output