51系列单片机无PWM输出功能，可以采用定时器配合软件的方法输出。对精度要求不高的场合，非常实用。电路图见图一，采用了高速光隔（6N137）输出，并将PWM的信号倒相。-51 series no PWM output, the timer can be used with the software, the method output. On occasions, less precision, very practical. Circuit shown in Figure 1, using h

汇编语言实现PIC单片机IO口输出PWM波形，经过试验证实，软件没有任何问题。-Assembly language PIC microcontroller IO port output PWM waveform, after tests confirmed that the software without any problems.

SVPWM硬件软件实施方法，用于永磁同步电机的控制，PWM产生器-SVPWM hardware and software implementation of the method for controlling a permanent magnet synchronous motor, PWM generator