说明：  单片机课程设计：波形发生器。使用ADDA芯片PCF8591 1.可产生锯齿波、三角波、方波； 2.通过三个按键选择输出的波形，可选择不同幅值和频率； 3.需要在仿真软件上绘制设计电路图，并仿真实现 4.使用开发板设计实现，可外接示波器观察结果
(SCM curriculum design: a waveform generator. Chip PCF8591 1. Use ADDA generates sawtooth, triangle, square wave 2. Select waveform output by three buttons, you can choose different amplitude and frequency 3. need to draw on the schematic design simulation software and Simulation 4 using the board has been designed to achieve, can be an external oscilloscope observations)