同时用两个定时器控制蜂鸣器发声，定时器0控制频率，定时器1控制同个频率持续的时间，间隔300ms依次输出1，10，50,100，200,400,800,1k（hz）的方波

-The same time with two buzzer timer control, timer 0 control frequency, Timer 1 control with a frequency duration of 300ms intervals sequentially outputs 1,10,50,100,200,400,800,1 k (hz) square wave