说明：  频率计是我们经常会用到的实验仪器之一，本实验要使用单片机和计数电路及液晶器件来设计一个宽频的频率计。期望达到10Hz－1.1G范围的频率精确测量。
(Frequency counter is that we often use one of the experimental apparatus, the experiment to count the use of single-chip and circuit and liquid crystal devices to the design of a broadband frequency meter. Expected range of 10Hz-1.1G accurate measurement of frequency.)