10MHz频率计，采用51单片机，22.1184MHz晶振。分频器使用双4位二进制计数器74HC393，数据选择器使用74HC151。-10MHz frequency counter, using 51 Microcontroller, 22.1184MHz crystal. Divider using a dual 4-bit binary counter 74HC393, data selector used 74HC151.

74HC393中文资料！很详细的哦.大家慢慢看-74HC393

主要是测量频率 可达到0.1Hz--8MHz 运用了分频器进行分频 并且可以测量峰峰值-Mainly the peak measurement frequencies up to 0.1Hz--8MHz This use of a divider to divide and can measure the peak