采用编程的方法来实现三角波、锯齿波、矩形波、正弦波的发生。根据设计的要求，对各种波形的频率和幅度进行程序的编写，并将所写程序装入单片机的程序存储器中。在程序运行中，当接收到来自外界的命令，需要输出某种波形时再调用相应的中断服务子程序和波形发生程序，经电路的数/模转换器和运算放大器处理后，从信号发生器的输出端口输出-Programming method to achieve the triangle wave, sawtooth, square wave, sine wave occurred. The frequency and amplitude of the waveform according to the design requirements, procedures for the preparation and the written program into the microcontroller s program memory. The program is running, received a command from the outside world, you need some kind of waveform output then calls the appropriate interrupt service routine and waveform generation process, the processing circuit D/A converter and an operational amplifier, from the signal generator output port of