通过avr单片机实现spwm波形的控制，讲解spwm波的实现原理，功能可靠。通过avr单片机仿真调试通过。-Through the avr microcomputer control, the explanation of SPWM wave SPWM wave principle, the realization of the function and reliable. Through the avr single-chip microcomputer simulation test thr