简易数字频率计的设计

文档编号:CK077   文档字数:10394,页数:31

摘  要
 频率测量是电子技术主要测试对象之一，它和现代通讯、广播技术紧密相连，它们的频段都有严格的限定，其频率的建立也有相应的要求，否则要引起相互干扰。这就促进了频率技术的发展。测量频率的方法有多种，其中电子计数器测量频率具有使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。本文介绍了一种基于MCS-51单片机，采用模块化布局的简易数字频率计的设计方法，在软件设计上采用了单片机的C语言设计，系统软件的设计简单明了，在测量频率时采用测频和测周相结合的方法，提高了频率计的测量精度。主要功能有：频率测量和周期测量。整个设计可以分为三个部分：设计原理、硬件设计、软件设计。本文详细介绍了简易数字频率计的硬件设计和软件设计。
关键词：频率；单片机；分频；测量；显示

Abstract
 Frequency measurement is one of main the testing object for electronic technology. It closely linked to modern communication and broadcasting technology, whose frequency brand have severe limit and the setting of frequency also has corresponding requirement, otherwise it will cause mutual interference. Therefore it speeds up the development of frequency technology. There are many methods to measure frequency and using electronic counter to measure frequency is one of the key methods to measure frequency, which has following advantages: use conveniently, measure rapidly and easy to realize process automation. The text introduces one design method of simple digital frequency meter, which bases on the MCS-51 single chip and adopts modular layout. It uses C language to design software, which is simple and easy to understand. In order to increase the precision of frequency meter, it adopts the combination of frequency measurement and cycle measurement. The main functions of the frequency meter are frequency measurement and cycle measurement. The whole design can divide into three parts: design principle, hardware design and software design. The text has particularly introduced the hardware design and software design of the frequency meter.

Key words: frequency; single chip; frequency division; measure; display

目  录
摘  要 I
Abstract II
目  录 III
1  前言 1
 1.1国内外研究现状 1
 1.2 课题的意义 2
 1.2.1 课题的背景 2
 1.2.2 课题的意义 3
 1.3 课题的目的及目标 3
 1.3.1 课题的目的 3
 1.3.2 课题的目标 3
2  简易数字频率计的硬件设计 4
 2.1 系统硬件总叙述 4
 2.2 单片机介绍 4
 2.3 总电路图各部分电路设计 8
 2.3.1 电源 10
 2.3.2 波形转换电路 10
 2.3.3 计数电路 10
 2.3.4 显示电路 11
 2.3.5 复位电路 13
 2.3.6 时钟电路 .15
 3  简易数字频率计的软件设计 17
3.1 Keil uVision2介绍 ..17
3.2 软件流程 19
 3.3 脉冲信号计数模块 20
 3.4 定时模块 20
 3.5 频率显示模块 20
4  结论 21
致谢 22
参考文献 23
附录 24

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