利用AT89S51单片机的T0、T1的定时计数器功能，来完成对输入的信号进行频率计数，计数的频率结果通过8位动态数码管显示出来。-AT89S51 MCU using T0, T1 of the timer counter functions, to complete the input signal frequency count, counting the frequency of results by 8-bit dynamic digital tube display.