摘 要
電子計(jì)數(shù)器是電子測量領(lǐng)域中最常見的測量儀器之一，它可以測量方波和正弦波的頻率、周期和脈沖寬度等時(shí)間參數(shù)。
本設(shè)計(jì)主要以AT89S52作為控制單元，采用了直接測量法完成高精度頻率計(jì)的設(shè)計(jì)，在軟件編程中采用的是C語言。本論文由五部分組成：第一部分是緒論；第二部分是電子計(jì)數(shù)器的原理介紹；第三部分是單元電路的設(shè)計(jì)；第四部分是程序設(shè)計(jì)；第五部分是結(jié)論。
系統(tǒng)以單片機(jī)AT89S52為核心的控制系統(tǒng)，不但縮短了開發(fā)研制周期，并使本系統(tǒng)具有結(jié)構(gòu)緊湊、體積小、可靠性高、測頻范圍寬、精度高等特點(diǎn)。

關(guān)鍵詞：頻率計(jì)；89S52單片機(jī)；C語言













Abstract
Electronic counter is the most common measure in the field of electronic measuring, it can measure many time parameters: frequency of square wave and sine wave, the time period, pulse width and so on.
The AT89S52 is the mainly control unit of the design, complete the high-precision frequency meter with direct measurement, the C programming language is used during Software programming. This paper consists of five parts, the first part is introduction, the second part introduces the principles of the electronic counter, and the third part is the design of the circuit unit, the fourth part is the program design, the fifth part is the conclusion.
AT89S52 microcontroller is the core of the control system, shorten the deceloped cycle, and so that the system has a compact structure, small size, high reliability and wide range of frequency measurement, high precision.

Key Words: Cymometer; The single chip microcomputer 89S52; C Programming Language












目 錄
摘 要 I
ABSTRACT II
1. 緒論 1
1.1 電子計(jì)數(shù)器概述 1
1.2 電子計(jì)數(shù)器背景及發(fā)展趨勢 2
1.3 課題研究的意義與作用 3
1.4 電子計(jì)數(shù)器的設(shè)計(jì)要求及技術(shù)指標(biāo) 4
2. 電子計(jì)數(shù)器的工作原理 5
2.1 電子計(jì)數(shù)器的基本功能 5
2.2 電子計(jì)數(shù)器的設(shè)計(jì)方案 5
2.2.1電子計(jì)數(shù)器的分類 5
2.2.2實(shí)現(xiàn)方法 6
2.3 電子計(jì)數(shù)器的工作原理 6
2.3.1電子計(jì)數(shù)器的基本工作原理 6
2.3.2電子計(jì)數(shù)器的基本結(jié)構(gòu) 9
3. 硬件電路設(shè)計(jì) 12
3.1 整形電路 12
3.2 閘門電路 13
3.3 計(jì)數(shù)電路 14
3.4 鎖存電路 16
3.5 顯示電路 17
3.6 控制電路 18
3.7 控制選擇電路 20
3.8 電源電路 21
3.9 整體電路圖 21
4. 軟件設(shè)計(jì) 25
結(jié)論 26
致謝 27
參考文獻(xiàn) 28
附錄： 29