用avr16单片机，编译环境在ICC实现对pwm波的控制，为9位快速pwm波模式。通过两个独立按键能实现对占空比的调节。频率在20khz以上。-With avr16 microcontroller, compile environment in the ICC to realize the control of PWM waves, a fast PWM waves for 9 mode. Through the two independent buttons can realize to the adjustment of the duly ratio. In more than 20 KHZ frequency.