8051单片机控制外部设备，读取外部设备状态，外部中断的应用，中断的深入理解，变量和标记的灵活应用，定时器的灵活应用，可编程自动控制的方法，按键控制设备动作的方法，PWM 输出的设计，存储器的读写，延时报警器的设计，各种报警音的设计，音乐播放的设计，程序模块化的设计等等知识。-8051 to control external equipment, reading the state of the external equipment, external interrupt the application interruption in-depth understanding of the variables and markers flexible application of the flexible application of the timer, programmable control methods Press the movement and control equipment, the design of PWM output, memory, reading, writing, the alarm delay the design, various alarm sound design, music and broadcast design, programming, etc. Modular design knowledge.