本程序用keilc编写，能在stc12c5a60s2单片机上使用，主要功能是，外部模拟量输入，经单片机内部A/D转换，直接送至单片机内部PWM寄存器，进行PWM波输出。-The program uses keilc prepared Nengzai stc12c5a60s2 SCM Shi Yong, the main function is the external analog input, Jing MCU internal A/D conversion, directly sent to