基于xc164cs，此程序通过定时器T3 定时中断改变P1L.6 口输出的方波频率，驱动蜂鸣器后即可发出各种 不同声音。-Based on xc164cs, this procedure to change the timer interrupt by the timer T3 port P1L.6 square wave output frequency, drive immediately after issuing a variety of different buzzer sound