數(shù)字頻率計(jì)嵌入式系統(tǒng)設(shè)計(jì)

電子信息工程論文編號:DZXX182  論文字?jǐn)?shù):10388,頁數(shù):26

目錄

摘要 I
Abstract II
第1章 引言 1
1.1 背景 1
1.2 意義 1
 1.3 研究內(nèi)容 2
第2章 頻率計(jì)的方案設(shè)計(jì) 3
 2.1 方案的論證 3
 2.2 方案的選擇 5
第3章  系統(tǒng)部件簡介 6
 3.1 AT89S51單片機(jī)簡介 6
 3.2 雙電壓比較器LM393簡介 8
第4章 頻率計(jì)的硬件設(shè)計(jì) 10
 4.1總體方案 10
 4.2 AT89S51單片機(jī)及其外圍電路 10
 4.3 波形轉(zhuǎn)換電路 10
 4.4 頻率顯示電路 11
第5章 單元程序設(shè)計(jì) 13
 5.1 1S定時 13
 5.2  T1計(jì)時程序 14
 5.3  頻率數(shù)據(jù)采集 15
 5.4 進(jìn)制轉(zhuǎn)換 15
 5.5  數(shù)碼顯示 16
第6章 系統(tǒng)調(diào)試和實(shí)現(xiàn) 18
 6.1系統(tǒng)硬件調(diào)試 18
 6.2系統(tǒng)軟件調(diào)試 18
 6.3整個系統(tǒng)調(diào)試 19
第7章  結(jié)束語 20
致  謝 21
參考文獻(xiàn) 22

摘要
 
 在電子技術(shù)中，頻率是最基本的參數(shù)之一，又與許多電參量的測量方案、測量結(jié)果都有十分密切的關(guān)系，因此頻率的測量就顯得更為重要。電子計(jì)數(shù)器測量頻率具有精度高、使用方便、測量迅速、便于實(shí)現(xiàn)以及測量過程自動化等優(yōu)點(diǎn)，因而成為頻率測量的重要手段之一。在本次畢業(yè)設(shè)計(jì)中選擇使用單片機(jī)來制作數(shù)字頻率計(jì)，并在實(shí)際制作中采用了直接測頻法。利用延時產(chǎn)生的時基門控信號來控制閘門，通過在單位時間內(nèi)計(jì)數(shù)器記錄下的脈沖個數(shù)計(jì)算出輸入信號的頻率，最終送入LED中顯示。這樣制作出來的頻率計(jì)不僅可以滿足設(shè)計(jì)題目的參數(shù)要求，而且具有了單片機(jī)的穩(wěn)定性和成熟性，且控制能力強(qiáng)，是一種低成本，高可靠的設(shè)計(jì)方案。
 
關(guān)鍵詞： 單片機(jī)，頻率計(jì)，測量

ABSTRACT

 With the unceasing development of electronic information industry, the measurement of the signal frequency is playing a significant role in theory study and practical application. In the project of electronic technology, frequency, which has great relation with the measurement methods and its measurement results, is one of the most basic parameters. Therefore, the measurement of frequency shows great importance. Among thousands of ways to measure frequency, electronic counter is taken as one of the best because of high precision, low time-cost, convenience, and automatic process. In this thesis, SCM was selected to make a digital frequency counter; meanwhile, direct measurement is taken in practice. Use the time-based gating signal created by time-delay to control the strobe. Compute the frequency with the help of the number of pulses recorded by the counter in specific time, then screen the result on the LCD. In this way, not only can my design reach the goal of my graduation thesis, but also it has stability and maturity.

Key Words: SCM，F(xiàn)requency，Measure