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1、摘要摘要一些傳統(tǒng)測量儀器使用復(fù)雜，容易造成讀數(shù)誤差。人們想用更加直接的方式讀取想要的數(shù)據(jù),減小讀數(shù)誤差。為了解決這個問題，各種數(shù)字顯示儀器應(yīng)運(yùn)而生。尤其是近年來，隨著大規(guī)模集成技術(shù)的發(fā)展，測量儀器精度越來越高，并且使用更加方便。本文提出基于AT89C51的數(shù)字電壓表，將模擬電壓量直接轉(zhuǎn)換成數(shù)字量并用數(shù)碼管顯示。首先介紹所用單片機(jī)的基本功能，以及所用集成電路的各管腳功能。其次對設(shè)計方案做整體介紹，模擬電壓量經(jīng)過模數(shù)轉(zhuǎn)換芯片ADC0809轉(zhuǎn)換成數(shù)字量，送入單片機(jī)進(jìn)行處理。最后輸出的數(shù)據(jù)在經(jīng)過CD4511譯碼直接驅(qū)動數(shù)碼管顯示電壓大小。最后介紹程序設(shè)計方案，用匯編語言編寫最終代碼，并用KE
2、IL和PROTUES聯(lián)機(jī)調(diào)試進(jìn)行仿真。調(diào)試完成之后進(jìn)行硬件焊接，實地測試并行改進(jìn)。關(guān)鍵詞：集成電路單片機(jī)模數(shù)轉(zhuǎn)換匯編語言KEILPROTUES摘要ABSTRACTThemethodofusingsometraditionalsurveytoolsisverycomplexandsomeerrorsresultfromoureyes.Sosomepeoplewanttogettheresultinamoredirectway.Theerrormadebyoureyescanbeavoided.Tosolvethisproblem,somesurveytoolsdisplayingits
3、resultinnumberhavebeenproduced.Inresentyears,withthedevelopmentofthelargeintegratedcircuit,thesurveytoolismoreconvenienttousewithhighaccuracy.ThisthesiscomesupwiththedigitalvoltmeterbasedonthechipmicrocomputerAT89C51.ThedigitalquantitydisplayedbyNixietubeareconvertedfromanalogquantitydirectly.F
4、irstly,thisthesisintroducethebasedfunctionofthemicrocomputerandtheintegratedcircuit.Themeaningoftheirpinswillbeexplainedindetail.Secondly,aoverallsummarywillbemadetointroducemydesignscheme.TheanalogquantitycanbeconvertedintothedigitalquantitybytheanalogtodigitalconverterADC0809.Thendataprocesse
5、dbythechipmicrocomputerwillbetransmittedintotheencoderCD4511.Theresultwillbedisplayedonthedigitaltubedrivedbytheencoder.Finally,thisthesisintroducestheprogramcodewroteintheassemblylanguage.ThecircuitwillbesimulatedbytheKEILandPROTUES.Hardwarecircuitaremadeafterthesimulation.Theworkershouldbetes
6、tedinpractiseandimproved.Keyword:integratedcircuitchipmicrocomputeranalogtodigitalassemblylanguageKEILPROTUES目錄i目錄第一章緒論11.1數(shù)字電壓表簡介11.2數(shù)字電壓表的優(yōu)點11.3數(shù)字電壓表發(fā)展趨勢21.4設(shè)計電壓表基本工作原理2第二章總體方案設(shè)計32.1設(shè)計要求32.2設(shè)計思路32.3設(shè)計方案3第三章硬件電路設(shè)計53.1單片機(jī)統(tǒng)53.1.1單片機(jī)的定義53.1.2AT89C51性能53.1.3AT89C51各管腳功能63.2復(fù)位電路和時鐘電路83.2.1復(fù)位電路83.2.
7、2時鐘電路設(shè)計93.3A/D轉(zhuǎn)換模塊103.3.1逐次逼近式A/D轉(zhuǎn)換器工作原理103.3.2ADC0809主要特征113.3.3ADC0809外部引腳特征113.4LED顯示系統(tǒng)設(shè)計143.4.1LED基本結(jié)構(gòu)143.4.3LED譯碼方式173.4.4LED顯示器與單片機(jī)接口設(shè)計173.5總體電路設(shè)計18第四章程序設(shè)計214.1程序設(shè)計總方案214.2系統(tǒng)子程序設(shè)計214.2.1初始化程序214.2.2A/D轉(zhuǎn)換子程序214.2.3顯示子程序224.3編
