12232驱动程序，我在AT89S51上验证OK了，请下载-12232 driver, I AT89S51 to validate OK, please download the

51单片机PWM占空比调整演示程序 我花了一点时间，编写了这个程序，非常实用！（通过测试，注意:AT89S51单片机，有的单片机P3_7需要改为P3^7）-51 singlechip PWM duty cycle adjustment demonstration program I spent a little time, write the program, very practical! (through testing, note: AT89S51 MCU MCU P3_7, s