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。要求能够对0－250KHZ的信号频率进行准确计数，计数误差不超过±1HZ。-The AT89S51 microcontroller T0, T1 timing counter function to complete the input signal frequency count, counting the frequency of the results of an 8-bit dynamic digital tube display. Requirement to accurately count the frequency of the signal of 0-250KHZ, counting error of not more than 1 Hz.