一种多功能频率计，由门电路和单片机实现，0.1-10M的信号频率测量，效果理想！-A multifunctional Cymometer from gate circuit and ,0.1-10M single-chip realization of the signal frequency measurement, the results are satisfactory!

本程序利用MSP430单片机的定时/比较功能检测输入脉冲的频率，并给出相应的I/O口输出量-This procedure using MSP430 single chip timer/comparison function detecting the frequency of the input pulse, and gives the corresponding I/O port output

用AT89C2051单片机的两路定时器实现两路6种频率的方波信号输出，根据按键选择改变频率-AT89C2051 microcontroller implemented using two two six kinds timer frequency square wave signal output, according to changes in the frequency button to select