频率计，测时法，测周法测量频率，555产生频率信号，利用单片机实现测量并显示在LED上-Cymometer measured when the law, measuring the frequency of testing weeks, 555 have a frequency signal, using SCM measurement and display in the LED on the

此为基于单片机的频率计设计。利用汇编语言实现了采样频率，用LED数码管输出频率数值等功能。-This is based on the frequency of single-chip design. The use of assembly language to achieve a sampling frequency, with LED digital tube output frequency numerical functions.

由P3.4输入脉冲的频率，测得频率送LED数码管显示。(The frequency of the pulse is input by P3.4, and the measured frequency is displayed by the LED digital tube.)