数字频率计设计(PCB图+电路图+源程序) 第2页
摘 要
在电子技术中，频率是最基本的参数之一，并且与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率测量在科技研究和实际应用中的作用日益重要。传统的频率计通常采用组合电路和时序电路等大量的硬件电路构成，产品不但体积较大，运行速度慢，而且测量低频信号时不宜直接使用。由于把微型计算机的功能引入到了数字仪表，因此测量的数字化、智能化逐渐成为当前测量技术的发展趋势。测量频率的方法有很多种，为了实现智能化的计数测频，实现一个宽领域、高精度，高速度的频率计,一种有效的方法是将单片机用于频率计的设计当中, 便于实现测量过程自动化。本课题介绍以51单片机作为核心器件，另外还包括信号输入、信号放大、信号选择、时钟提供、数据显示等功能模块的数字频率计的设计方法。频率计的硬件电路是用Protel绘图软件绘制而成，软件部分的单片机控制程序，是用汇编语言编写而成。由于本设计采用了模块化的设计方法，具有性能优良，精度高，可靠性好等特点，提高了测量频率的范围。
关键词：测量；频率计；单片机；汇编
Design of a digital frequency meter based on SCM
Abstract
Among electronic technology, frequency is one of the most basic parameters, and result of measuring have a very close relation to a lot of electric parameters, so the measurement of frequency in research and practical application of science and technology play an increasingly important role in. The frequency of the traditional combination of commonly used circuits and sequential circuits, such as a large number of hardware circuit, the product is not only bulky, slow, and the measurement of low-frequency signal should not be used directly. As a result of the function of the micro-computer into a digital dashboard, so the number of measurements, intelligence gradually has become the development trend of measurement technology . Measuring frequency There are many ways in order to realize the counting of intellectuality examines frequently, realize a wide-range, high-accuracy and high-speed cymometer, an effective method is to use one-chip computer for the design of the cymometer. Facilitate the realization of measurement process automation. This subject recommends regarding 51 Single-Chip computer as the key device, include signal input, signal amplify, signal choose, clock offer, data person who reveal function digital design method of cymometer of module still in addition. The hardware circuit of the cymometer is drawing with Protel mapping software, the one-chip computer control procedure of the software part, wrote the assembler language. Because originally design the design method to adopt module, improve the range of measuring frequency.
Key words: Measurement； Cymometer； Single-Chip computer； Compilation
目 录
第1章 绪 论 1
1.1 概述 1
1.2 课题选择的意义 1
1.3 国内外研究状况 2
1.4 频率计的技术要求 3
1.5 制作数字频率计的步骤 3
第2章 方案提出与论证 4
2.1 频率测量原理 4
2.2 频率测量方法概述 4
2.3 可用方案介绍 5
2.4 确定方案 6
第3章 系统硬件设计 6
3.1 系统硬件总述 6
3.2 信号输入电路 7
3.2.1 信号输入1通道电路 7
3.2.2 信号输入2通道电路 9
3.3 开关电路 10
3.4 计数电路 10
3.5 AT89C51介绍 12
3.6 数字频率计显示电路 13
3.7 时钟控制电路 15
3.8 电源电路 16
第4章 系统软件设计 16
4.1 系统软件总述 16
4.2 显示器初始化 17
4.3 计数子程序 19
4.4 数制转换子程序 20
4.5 显示子程序 22
附录1：电路图 25
附录2： PCB图 26
附录3：频率计总程序 27
参考文献 34
致 谢 829
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