单片机数字频率计的毕业设计论文.docx

基于单片机的数字频率计的设计【摘要】本设计以 AT89S52 单片机为核心充分利用硬件资源设计的一种频率计, 该频率计首先将被测信号放大整形处理, 变成满足单片机 I/O 口接受的 TTL/ CMOS 兼容信号从单片机的 T1 输入口输入直接累加脉冲数, 将单片机内部定时器定时为 1S , 这时累加的脉冲数即为被测信号的频率。最后经单片机处理送至 lcd 液晶显示屏显示。【关键字】单片机( AT89S52 )、放大整形、数据处理、 1602aLCD 、【 Abstract 】 This design take at89S52 monolithic integrated circuit as the core full use hardware source design's one kind of frequency meter, this frequency meter will be measured first that signal enlargement reshaping processing, turns satisfies TTL/which the monolithic integrated circuit I/O mouth accepts the patible signal from monolithic integrated circuit's T1 input port input direct summation pulse number, the monolithic integrated circuit interior timer fixed time is 1S, by now accumulated the pulse number namely for is measured the signal the frequency. Finally passes through monolithic integrated circuit processing to deliver to the lcd liquid crystal display monitor demonstration. 【 Keyword 】 AT89S52 、 Larger plastic 、 Data processing 、 1602aLCD 目录引言..................................................................................................................................................... 2 1 系统概述.......................................................................................................................................... 3 数字频率计概述........................................................................................................................... 3 基本设计原理.............................................................................................................................. 3 方案选择...................................................................................................................................... 3 2 数字频率计(低频)的硬件结构设计......................................................................................... 3 系统硬件的构成.......................................................................................................................... 3 AT89S52 单片机及其引脚说明.............