这是我以前写的频率计程序，用的是51单片机，开发环境是keil。功能是把测量到的频率在1602液晶上事实显示出来。-This is what I used to write the frequency of accounting procedures, using 51 single-chip, the development environment is keil. Function is the measured frequency on the facts in the 1602 LCD display.