利用单片机定时器完成计时功能，定时器0计时中断程序每隔0.01s中断一次并当作一个计数，设定定时1秒的中断计数初值为100，每中断一次中断计数初值减1，当减到0时，则表示1s到了，秒变量加1，同理再判断是否1min钟到了，再判断是否1h到了-Completion time using MCU timer functions, Timer 0 interrupt timer interrupt routine once every 0.01s, and as a counter, set the timer interrupt 1 second count initial value of 100, an interrupt for each interrupt initial count minus 1, when reduced to 0, then the 1s to, plus a second variable, then Similarly, to determine whether the clock 1min, 1h and then determine whether to