这个是关于pic16f877a的pwn模块的程序，这个是利用pic单片机内部的pwn模块来驱动led灯和蜂鸣器的使用，里面句句配套说明。-This is about pic16f877a PWN module of the procedure, this is to use the PIC microcontroller internal PWN module to drive led lights and a buzzer use, form a complete set inside that every.