基于at89s52单片机的C51直流电机PWM测速源程序,C51-based Microcontroller at89s52 DC Motor PWM Speed source

用AT89S52的T0一个定时器控制同时输出四路不同占空比的PWM波形。-AT89S52 of T0 with a timer control at the same time four different duty cycle PWM output waveform.