基于单片机的频率计设计.doc

PAGE PAGE 2 PAGE PAGE 1 基于单片机的频率计设计 摘 要 在电子技术中，频率是最基本的参数之一，它与许多电参数的测量方案和结果密切相关，因此频率测量显得尤为重要。有很多方法可以测量频率。其中，电子计数器具有测量精度高、使用方便、测量快速、测量过程易于自动化等优点，是最重要的频率测量手段之一。 本文设计了一种以AT89C51单片机为核心的微型频率计。设计中利用单片机的数学运算和控制功能，克服了普通数字频率计低频精度的缺点。频率计首先将单片机内部定时/计数器产生的1s定时作为控制门信号，然后计算被测信号放大整形的方波脉冲信号的周期。得到被测信号的频率值，并由八位动态显示电路显示。该频率计设计简单，携带方便，扩展性强，应用范围广。 关键词：AT89C51单片机；微型频率计；设计 Abstract In the electronic technology, frequency is one of the most basic parameters, and with many electric parameter measurement scheme, the measured results have very close relationship, so frequency measurement is more important. there are multiple ways of measuring the frequency of electronic counter measure frequency has high precision, easy to use, fast, and easy to implement measurement process automation, etc., is one of the important means of frequency measurement. In this paper, a micro frequency meter is designed with single chip computer AT89C51. In the design, the mathematical operation and control function of the single-chip microcomputer are applied to overcome the disadvantages of low frequency accuracy of the general digital frequency meter. Frequency meter first internal timer/counter of MCU 1 s time as a control gate signal, then the measured signal cycle of square wave pulse signal after amplification plastic as the count, the frequency of the signal being measured values, obtained finally by eight dynamic display circuit display values. This frequency meter is simple in design, easy to carry, strong expansion ability and wide application scope. Key words: AT89C51 single chip microcomputer; Micro frequency meter; design 目 录 TOC \o 1-3 \h \u 30746 摘 要 I 11964 引言 1 19319 1 系统总体方案设计 1 9870 1.1 频率计的测量原理 1 26596 1.2 方案论证与比较 2 14528 2 系统硬件设计 3 8578 2.1 系统原理 3 18281 2.2 AT89C51主控制器模块 4 7841 2.1.1 AT89C51的介绍 4 16866 2.1.2 复位电路 5 4693 2.3 单片机的定时\计数 6 5000 2.3.1 定时器\计数器的结构 6 5306 2.3.2 定时器\计数器的四种工作方式 7 11635 2.3.3 T1定时初值的设置 9 20041 2.4 电源模块 9 10992 2.5 放大整形模块