A22006屆本科畢業(yè)設(shè)計基于單片機的數(shù)字電壓表設(shè)計姓名系別物理與信息工程系專業(yè)電子信息工程學(xué)號指導(dǎo)教師2006年4月12日A3基于單片機的數(shù)字電壓表摘要本文介紹一種基于89S52單片機的一種電壓測量電路,該電路采用ICL7135高精度、雙積分A/D轉(zhuǎn)換電路，測量范圍直流02000伏，使用LCD液晶模塊顯示，可以與PC機進行串行通信。正文著重給出了軟硬件系統(tǒng)的各部分電路，介紹了雙積分電路的原理，89S52的特點，ICL7135的功能和應(yīng)用，LCD1601的功能和應(yīng)用。該電路設(shè)計新穎、功能強大、可擴展性強。關(guān)鍵詞電壓測量，ICL7135，雙積分A/D轉(zhuǎn)換器，1601液晶模塊ABSTRACTTHEINTRODUCTIONOFACOSTBASED89S52MCUAVOLTAGEMEASUREMENTCIRCUITS,THECIRCUITSUSEDICL7135HIGHPRECISION,DUALSCORINGA/DCONVERSIONCIRCUITS,MEASURINGSCOPEDC02000VOLTS,THEUSEOFLCDTHATCANBECARRIEDOUTWITHAPCSERIALCOMMUNICATIONSG17THEPAPERFOCUSESONPROVIDINGASOFTWAREANDHARDWARESG92STEMCOMPONENTSCIRCUIT,INTRODUCEDDOUBLEINTEGRALCIRCUITTHEORG92,89S52FEATURESICL7135FUNCTIONSANDAPPLICATIONS,LCD1601FUNCTIONSANDAPPLICATIONSG17THECIRCUITDESIGNINNOVATIVE,POWERFUL,CANBEEG91PANSIONARG92STRONGG17KEYWORDSDIGITALG57OLTMETERICL7135LCD160189S521前言G6980G4395電壓G15932G708DIGITALG57OLTMETERG709G12628G12228DG57M，G4439G7171采用G6980G4395G2282測量G6228G7427，G6238G17842G13505的模G6323量G708直流G17767G1849電壓G709轉(zhuǎn)換G6116G993G17842G13505、G12175G6967的G6980G4395G5430G5347G5194G2164以顯示的G1214G15932。G1268統(tǒng)的G6363G19036G5347電壓G15932功能單一、精度G1314，G993能G9397G17287G6980G4395G2282G7114G1207的G19668G8726，采用單片機的G6980G4395電壓G15932，G11013精度高、G6251G5190G6212能G2159強，可擴展性強、G19610G6116G7053G1427，G17836可與PC進行G4466G7114通信。G11458G2081，G11013各種單片A/D轉(zhuǎn)換器G7512G6116的G6980G4395電壓G15932，G5062G15999G5203G8879用于電G4388G2462電G5049測量、G5049G1006G14270G2172G2282G1214G15932、G14270G2172測G16809系統(tǒng)G12573G7246能G2282測量G20058G3507，示出強大的G10995G2641G2159。與G8504G2528G7114，G11013DG57M擴展G13792G6116的各種通用G2462G999用G6980G4395G1214器G1214G15932，G1075G6238電量G2462G19762電量測量G6228G7427G6564高G2052G4865新G8712G5191。本G12468重點介紹單片A/D轉(zhuǎn)換器以G2462G11013G4439G1216G7512G6116的基于單片機的G6980G4395電壓G15932的G5049G1328原理。A4輸入電路A/D轉(zhuǎn)換89S52單片機LCD顯示通訊模塊2系統(tǒng)原理及基本框圖G3926G32822G171G6164示，模G6323電壓G13475G17819G7735G1313G2011換G2052G993G2528的分壓電路G15940G1955G2530，G13475G19560G12175G5190G6212G17877G2052A/D轉(zhuǎn)換器進行A/D轉(zhuǎn)換，G9994G2530G17877G2052單片機G1025進行G6980G6466G3800理。G3800理G2530的G6980G6466G17877G2052LCDG1025顯示，G2528G7114通G17819串行通G16771與G990G1313機通信。G32822G171系統(tǒng)基本G7053G7706G32823硬件設(shè)計31輸入電路G32823G171G171量G12255G2011換G5332G1863G32823G171G172G15940G1955G17767G1849電路G17767G1849電路的G1328用G7171G6238G993G2528量G12255的G15999測的電壓G16280范G2052A/D轉(zhuǎn)換器G6164G16213G8726的電壓G1552。G7246能G2282G6980G4395電壓G15932G6164采用的單片雙積分G3423ADCG14467片ICL7135，G4439G16213G8726G17767G1849電壓02G57。本G1214G15932設(shè)計G717101000G57電壓，G9801G6947度高G6164以可以G993G2164G2081G13634G6930大器，G2494G19668G15940G1955器，G3926G32823G171G172G6164示9M、900G46、90G46、和10G46電G19471G7512G61161/10、1/100、1/1000的G15940G1955器。G15940G1955G17767G1849電路可G11013G5332G1863G7481G17885G6333G993G2528的G15940G1955G10587，G1186G13792G2011換G7735G1313。G1038了能G16765CPUG14270G2172識別G7735G1313，G17836G16213有G32823G171G171的硬件G17842接。32A/D轉(zhuǎn)換電路A/D轉(zhuǎn)換器的轉(zhuǎn)換精度對測量電路極其重G16213，G4439的參G6980G1863系G2052測量電路性A5能。本設(shè)計采用雙積A/D轉(zhuǎn)換器，G4439的性能比較穩(wěn)定，轉(zhuǎn)換精度高，具有很高的G6251G5190G6212能G2159，電路結(jié)G7512G12628單，其缺點G7171G5049G1328速度較G1314。在對轉(zhuǎn)換精度G16213G8726較高，G13792對轉(zhuǎn)換速度G16213G8726G993高的場合G3926電壓測量有G5203G8879的應(yīng)用。321雙積A/D轉(zhuǎn)換器的工作原理G32823G172G171G171雙積A/D轉(zhuǎn)換器G3926G3282G6164示對G17767G1849模G6323電壓和基準(zhǔn)電壓進行兩次積分，先對G17767G1849模G6323電壓進行積分，將其變換G6116與G17767G1849模G6323電壓G6116正比的G7114間間G19560T1，再利用計G6980器測出G8504G7114間間G19560，則計G6980器G6164計的G6980G4395量就正比于G17767G1849的模G6323電壓；接著對基準(zhǔn)電壓進行G2528樣的G3800理。在常用的A/D轉(zhuǎn)換G14467片G708G3926ADC0809、ICL7135、ICL7109G12573G709G1025，ICL7135與其余幾種有G6164G993G2528，G4439G7171一種四G1313半的雙積分A/D轉(zhuǎn)換器，具有精度高G708精度相當(dāng)于14G1313二進制G6980G709、價格G1314廉、G6251G5190G6212能G2159強G12573優(yōu)點。本文介紹用單片機G5194行G7053G5347采G19610ICL7135的G6980G6466以G4466現(xiàn)單片機電壓G15932和小G3423G7246能G1214G15932的設(shè)計G7053案。G32823G172G171G172雙積A/D轉(zhuǎn)換器的波G5430G3282A63217135的應(yīng)用7135G7171采用CMOSG5049藝制G1328的單片4G1313半A/D轉(zhuǎn)換器，其G6164轉(zhuǎn)換的G6980G4395G1552以多G5049掃描的G7053G5347G17767出，G2494G16213附G2164譯碼器，G6980碼顯示器，驅(qū)G2172器G2462電G19471電容G12573元件，就可組G6116一個G9397量G12255G10382G57的G6980G4395電壓G15932。7135主G16213特點G3926下雙積G3423A/D轉(zhuǎn)換器，轉(zhuǎn)換速度慢。在每次A/D轉(zhuǎn)換G2081，內(nèi)部電路都G14270G2172進行調(diào)零操G1328，可保證零點在常溫下的長期穩(wěn)定。在20000G4395G7082G57G9397量G12255G709范圍內(nèi)，保證轉(zhuǎn)換精度1G4395相當(dāng)于14BITA/D轉(zhuǎn)換器。具有G14270G2172極性轉(zhuǎn)換功能。能在但極性參考電壓下對雙極性模G6323G17767G1849電壓進行A/D轉(zhuǎn)換，模G6323電壓的范圍G103801G179999G57。模G6323出G1849可以G7171差G2172信號，G17767G1849電G19471極高，G17767G1849電流典G3423G15521PA。G6164有G17767出端和TTL電路相容。有G17819量G12255G708ORG709和欠量G12255G708URG709標(biāo)志信號G17767出，可用G1328G14270G2172量G12255轉(zhuǎn)換的控制信號。G17767出G1038G2172態(tài)掃描BCD碼。對外G6564供六個G17767G1849,G17767出控制信號R/H,BUSH,ST,POL,OR,UR,因G8504除用于G6980G4395電壓G15932外,G17836能與異步接收/發(fā)G17877器,微G3800理器或其G4439控制電路G17842接使用。采用28外引線雙列直插G5347封裝，外引線功能端排列G3926G3282G6164示。7135G6980G4395部分G6980G4395部分主G16213G11013計G6980器、鎖存器、多路G5332G1863G2462控制G17935G17765電路G12573組G6116。7135一次A/D轉(zhuǎn)換G2620期分G1038四個G19466G85851、G14270G2172調(diào)零G708AG61G709；2、G15999測電壓積分G708IG49TG709；3、基準(zhǔn)電壓G2465積分G708DG40G709；4、積分G3250零G708G61IG709。具G1319內(nèi)部轉(zhuǎn)換G17819G12255G17837G18336G993G1582G12089G13466介紹，主G16213介紹引G14062的使用。R/HG70825G14062G709當(dāng)R/HG32G2561G257G708該端G5760G12366G7114G1038G2561G257G709G7114，7135G3800于G17842G13505轉(zhuǎn)換G10378態(tài)，每40002個G7114G19059G2620期G4448G6116一次A/D轉(zhuǎn)換。G14521R/HG11013G2561G257變G2560G257，則3G172G171G171ICL7135引G14062G3282A77135在G4448G6116本次A/D轉(zhuǎn)換G2530進G1849保G6357G10378態(tài)，G8504G7114G17767出G1038G7380G2530一次轉(zhuǎn)換結(jié)G7536，G993G2475G17767G1849電壓變G2282的G5445G2721。因G8504利用R/H端的功能可以使G6980G6466有保G6357功能。G14521G6238R/H端用G1328G2563G2172功能G7114，G2494G16213在該端G17767G1849一個正G14045G1926G708G4497度G305300NSG709，轉(zhuǎn)換器就G1186AG61G19466G8585G5332G3999進行A/D轉(zhuǎn)換。G8892G5859G12544一次轉(zhuǎn)換G2620期G1025的AG61G19466G8585G7114間G1038900110001個G7114G19059G14045G1926，G17837G7171G11013于G2563G2172G14045G1926和內(nèi)部計G6980器G10378態(tài)G993G2528步G17908G6116的。/STG70826G14062G709每次A/D轉(zhuǎn)換G2620期結(jié)G7475G2530，ST端都G17767出5個G17139G14045G1926，其G17767出G7114間對應(yīng)在每個G2620期G5332G3999G7114的5個G1313G17885信號正G14045G1926的G1025間，STG17139G14045G1926G4497度G12573于1/2G7114G19059G2620期。G12544一個STG17139G14045G1926在G990次轉(zhuǎn)換G2620期結(jié)G7475G2530101個G7114G19059G2620期G1147G10995。因G1038每個G17885信號G708D5D1G709的正G14045G1926G4497度G1038200個G7114G19059G2620期G708G2494有AG61和DG40G19466G8585G5332G3999G7114的G12544一個D5的G14045G1926G4497度G1038201個CLG46G2620期G709，G6164以STG17139G14045G1926G1055間相G19560G1075G7171200個G7114G19059G2620期。G19668G16213G8892G5859的G7171，G14521G990一G2620期G1038保G6357G10378態(tài)G708R/HG32G2560G257G709則STG7092G14045G1926信號G17767出。ST信號主G16213用G7481控制將轉(zhuǎn)換結(jié)G7536G2533外部鎖存器、UARTS或微G3800理器進行G1268G17877。BUSG60G70821G14062G709在雙積分G19466G8585G708IG49TG14DG40G709，BUSG60G1038高電G5191，其余G7114G1038G1314電G5191。因G8504利用BUSG60功能，可以G4466現(xiàn)A/D轉(zhuǎn)換結(jié)G7536的G17840G17329G12175雙線G1268G17877，其G17836原G7053G8873G7171將BUSG60和CLG46G256與G257G2530G7481計G6980器，再G1955G244710001就可G5483G2052原G7481的轉(zhuǎn)換結(jié)G7536。ORG70827G14062G709當(dāng)G17767G1849電壓G17241出量G12255范圍G70820000G709，OR將G1262變高。該信號在BUSG60信號結(jié)G7475G7114變高。在DG40G19466G8585G5332G3999G7114變G1314。URG70828G14062G709當(dāng)G17767G1849電壓G12573于或G1314于G9397量G12255的9G8G708G16847G6980G10381800G709，則一當(dāng)BUST信號結(jié)G7475，UR將G1262變高。該信號在IG49TG19466G8585G5332G3999G7114變G1314。POLG70823G14062G709該信號用G7481G6363示G17767G1849電壓的極性。當(dāng)G17767G1849電壓G1038正，則POLG32823G172G171G172ICL7135的波G5430G3282A8G12573于G2561G257，G2465G1055則G12573于G2560G257。該信號DG40G19466G8585G5332G3999G7114變G2282，G5194G13512G6357一個A/D轉(zhuǎn)換調(diào)期。G1313驅(qū)G2172信號D5、D4、D3、D2、D1G70812、17、18、19、20G14062G709每一G1313驅(qū)G2172信號分別G17767出一個正G14045G1926信號，G14045G1926G4497度G1038200個G7114G19059G2620期，其G1025D5對應(yīng)G987G1313G17885通，以下G1393次G1038G2327、G11346、G2325、個G1313。在正常G17767G1849G5785G1929下，D5D1G17767出G17842G13505G14045G1926。當(dāng)G17767G1849電壓G17819量G12255G7114，D5D1在AG61G19466G8585G5332G3999G7114G2494分別G17767出一個G14045G1926，G9994G2530都G3800于G1314電G5191，直G14279DG40G19466G8585G5332G3999G7114G6177G17767出G17842G13505G14045G1926。利用G17837個特性，可使G5483顯示器件在G17819G12255G7114G1147G10995一G1154一G7275的直G16278現(xiàn)G16949。B8、B4、B2、B1G70816、15、14、13G14062G709該四端G1038轉(zhuǎn)換結(jié)G7536BCD碼G17767出，采用G2172態(tài)掃描G17767出G7053G5347，G2375當(dāng)G1313G17885信號D5G32G2561G257G7114，該四端的信號G1038G987G1313G6980的內(nèi)容，D4G32G2561G257G7114G1038G2327G1313G6980內(nèi)容，其余G1393次G12879G6524。在個、G2325、G11346、G2327四G1313G6980的內(nèi)容G17767出G7114，BCD碼范圍G103800001001，對于G987G1313G6980G2494有0和1兩種G10378態(tài)，G6164以其G17767出的BCD碼G1038G2560000G257和G2560001G257。當(dāng)G17767G1849電壓G17819量G12255G7114，各G1313G6980G17767出G1852部G1038零，G17837一點在使用G7114應(yīng)G8892G5859。G7380G2530G17836G16213G16840G7138一點，G11013于G6980G4395部分以DG42G49G42端G1328G1038接G3332端，G6164以G6164有G17767出端G17767出電G5191以DG42G49G42G1328G1038相對參考點。基準(zhǔn)電壓，基準(zhǔn)電壓的G17767G1849G5529G20047對于模G6323G1856G1861端COMG7171正電壓。G678與單片機系統(tǒng)的串行G17842接在ICL7135與單片機系統(tǒng)進行G17842接G7114，使用G5194行采G19610G7053G5347，G16213G17842接BCD碼G6980G6466G17767出線，可以將ICL7135的/STB信號接G14279AT89C52的P3G172G708IG49T0G709。ICL7135G19668G16213外部的G7114G19059信號，本設(shè)計采用CD4060G7481對4M信號進行32分G20069G5483G2052125G46HG93的G7114G19059信號。CD4060計G6980G1038G717G720G13435G718進制計G6980器，在G6980G4395G19610G6116電路G1025可G4466現(xiàn)的分G20069次G6980G7380高，G13792G1000CD4060G17836G2265G2559G6403G14645電路G6164G19668的G19762G19388，使用G7368G1038G7053G1427。A9G32823G172G171G173ICL7135與系統(tǒng)的G17842接G3282G32823G172G171G174CD4060G7114G19059發(fā)G10995電路33單片機部分單片機G17885用的G7171ATMG40LG1856G2508新G6524出的AT89S52，G3926G32823G172G171G171G6164示。該G14467片具有G1314功G13803、高性能的特點，G7171采用CMOSG5049藝的8G1313單片機，與AT89C51G4448G1852G1872容。AT89S52G17836有以下主G16213特點采用了ATMG40LG1856G2508的高G4506度、G19762G7143G3845性存G1660器G708G49G57SRAMG709G6228G7427；其片內(nèi)具有256G4395G14422RAM，8G46B的可在線G13546G12255G708ISPG709G41LASH存G1660器；有2種G1314功G13803G14422電G5049G1328G7053G5347G12366G19398模G5347和G6493電模G5347片內(nèi)G2559有一個G11487G19388G10411定G7114器G708G58DTG709，G58DTG2265G2559一個14G1313計G6980器和G11487G19388G10411定G7114器G3809G1313G4504存器G58DTRST，G2494G16213對G58DTRSTG6365G20046G5219先G1901G184901G40H，G2530G1901G18490G401H，G58DTG1427G2563G2172，當(dāng)CPUG11013于G6212G2172G13792使G12255G5219G19531G1849G8527G5502G10627或G256G17317G20146G257G10378態(tài)G7114，G58DTG2375可有G6940G3332使系統(tǒng)G3809G1313，G6564高了系統(tǒng)的G6251G5190G6212性能。34液晶顯示部分顯示接口用G7481顯示系統(tǒng)的G10378態(tài)，G2641令或采G19610的電壓G6980G6466。本系統(tǒng)顯示部分用的G7171LCD液晶模塊，采用一個161的G4395符G3423液晶顯示模塊，點陣G3282G5430G5347液晶G11013M行G49列個顯示單元組G6116，假設(shè)LCD顯示屏有64行，每行有128列，每8列對應(yīng)1個G4395G14422的8個G1313，G2375每行G1101316G4395G14422，G1861168G32128個點組G6116，屏G9906416個顯示單元和顯示RAM區(qū)1024個G4395G14422相對G32823G172G171G17189S52引G14062G3282A10應(yīng)，每一G4395G14422的內(nèi)容和屏G990相應(yīng)G1313G13634的G1154G7275對應(yīng)。一個G4395符G1101368或88點陣組G6116，G2375G16213找G2052和屏G990某幾個G1313G13634對應(yīng)的顯示RAM區(qū)的8個G4395G14422，G5194G1000G16213使每個G4395G14422的G993G2528的G1313G10381，其G4439的G10380，G10381的點G1154，G10380的點G7275，G17837樣一G7481就組G6116某個G4395符。但對于內(nèi)帶G4395符發(fā)G10995器的控制器G7481G16840，顯示G4395符就比較G12628單了，可G16765控制器G5049G1328在文本G7053G5347，根G6466在LCDG990G5332G3999顯示的行列號G2462每行的列G6980找出顯示RAM對應(yīng)的G3332址，設(shè)立光標(biāo)，在G8504G17877G990該G4395符對應(yīng)的G1207碼G2375可。3411601使用說明G32823G174G171G1711601引G14062G3282G159323G174G171G171LCD1601液晶模塊的引G14062引G14062符號功能G16840G71381G42G49D接G33322G57CC5G573G57L驅(qū)G2172LCD，一般將G8504G14062接G33324RSG4504存器G17885G63330G6363令G4504存器G708G58RITG40G709BUSG92FLAG,G1313址計G6980器G708RG40ADG7091G6980G6466G4504存器G708G58RITG40,RG40ADG7095R/G58RG40AD/G58RITG40G17885G63331RG40AD0G58TITG406G40G16847G1901使能G708下降沿使能G7097DB0G13144G1313三態(tài)、雙G2533G6980G6466總線A2A0G13505G159323G174G171G171LCD1601液晶模塊的引G140628DB19DB210DB311DB4高4G1313三態(tài)、雙G2533G6980G6466總線另外DB7G1075G7171一個BUSG92FLAG12DB513DB614DB7G4504存器G17885G6333，G3926G15932G6164示G159323G174G171G173G4504存器G17885G6333控制線操G1328RSR/G58操G1328G16840G713800G1901G1849G6363令G4504存器G708清除屏幕G12573G70901G16847BUSG92FLAGDB7,以G2462G16847取G1313址計G6980器G708DB0DB6G155210G1901G1849G6980G6466G4504存器G708顯示各G4395G3423G12573G70911G1186G6980G6466G4504存器G16847取G6980G6466BUSG92FLAGDB7在G8504G1313未G15999清除G1038G2560G257G7114，LCD將G7092G8873再G3800理其他G6363令G16213G8726。1顯示G3332址內(nèi)部G3332址計G6980器的計G6980G3332址SB7G320DB0DB6G12544一行00、01、02G12573，G12544二行40、41、42G12573，可配合檢測DB7G321RSG320,R/G58G321G16847取G11458G2081顯示G4395的G3332址，判斷G7171否G19668G16213換行。G159323G174G171G174LCD1601161顯示G4395的G3332址12345678910111213141516000102030405060740414243444546472外部G3332址DB7G321,亦G237580H內(nèi)部計G6980G3332址，可以用G8504G7053G5347將G4395顯示在某一G1313G13634。LCD各G3332址列舉G3926下G15932G159323G174G171G175LCD1601161顯示G4395的外部G3332址16116G43951行1601123456789101112131415168081828384858687C0C1C2C3C4C5C6C7A2A2G159323G174G171G176LCD1601的G6363令組G6363令G16840G7138設(shè)G13634碼RSR/G58D7D6D5D4D3D2D1D0清除顯示幕000000000光標(biāo)G3250G2052原點000000001進G1849模G5347設(shè)定00000001I/DS顯示幕OG49/OG41G410000001DCB移G1313000001S/CR/L功能設(shè)定00001DLG49G41G4395發(fā)G10995器G3332址設(shè)定0001AG42C設(shè)G13634顯示G3332址0001ADD忙碌標(biāo)志G1313BG41001BG41顯示G6980G646610G1901G1849G6980G6466G16847取G6980G646611G16847取G6980G6466I/DI/DG321G15932示G21641，I/DG320G15932示G19551SSG321G15932示顯示幕OG49SG320G15932示OG41G41DDG321G15932示顯示屏幕OG49DG320G15932示顯示屏幕OG41G41CCG321G15932示光標(biāo)OG49CG320G15932示光標(biāo)OG41G41BBG321G15932示閃爍OG49BG320G15932示顯示閃爍OG41G41S/CS/CG321G15932示顯示屏幕移G1313S/CG320光標(biāo)移G1313R/LR/LG321G15932示右移R/LG320G15932示左移DLDLG321G15932示8G1313DLG320G15932示4G1313G41G41G321G15932示510點矩陣G41G320G15932示57點矩陣G49G49G321G15932示2行顯示行G49G320G15932示1行顯示行BG41BG41G321內(nèi)部正在G2172G1328BG41G320可接收G6363令或G6980G6466碼342液晶顯示部分與89S52的接口G3926G3282G6164示用89S52的P2口G1328G1038G6980G6466線，用P0G171、P0G172、P0G173分別G1328G1038A2A3LCD的G40、R/G58、RS。其G1025G40G7171下降沿觸發(fā)的片G17885信號，R/G58G7171G16847G1901信號，RSG7171G4504存器G17885G6333信號本模塊設(shè)計G16213點G3926下顯示模塊初G3999G2282首先清屏，再設(shè)G13634接口G6980G6466G1313G10388G1313，顯示行G6980G10381行，G4395G3423G103857點陣，G9994G2530設(shè)G13634G1038整G1319顯示，取消光標(biāo)和G4395G1319閃爍,G7380G2530設(shè)G13634G1038正G2533增量G7053G5347G1000G993移G1313。G2533LCD的顯示緩G1926區(qū)G1025G17877G4395符，G12255G5219G1025采用2個G4395符G6980組，一個顯示G4395符，另一個顯示電壓G6980G6466，G16213顯示的G4395符或G6980G6466G15999G17877G2052相應(yīng)的G6980組G1025，G4448G6116G2530再統(tǒng)一顯示G17首先取一個G16213顯示的G4395符或G6980G6466G17877G2052LCD的顯示緩G1926區(qū)，G12255G5219延G71142G175MS,判斷G7171否夠顯示的個G6980，G993夠則G3332址G2164一取下一個G16213顯示的G4395符或G6980G6466。35通訊模塊89S52內(nèi)部G5062G19610G6116通信接口URT，G2494G19668擴展一片MAX232G14467片將G17767出信號轉(zhuǎn)換G6116RS232協(xié)議G16280定的電G5191標(biāo)準(zhǔn),MAX232G7171一種雙組驅(qū)G2172器/接收器，每個接收器將G40IA/TIA232G40電G5191G17767G1849轉(zhuǎn)換G10385G57TTL/CMOS電G5191。每個驅(qū)G2172器將TTL/CMOSG17767G1849電G5191轉(zhuǎn)換G1038G40IA/TIA232G40電G5191。G2375G40IA接口，就G7171G62385G57轉(zhuǎn)換G10388G57G205215G57電G13130G57轉(zhuǎn)換G10388G57G205215G57再G13475RXDG17767出，接收G7114G11013RXDG17767G1849，G62388G57G205215G57電G1313轉(zhuǎn)換G10385G57，8G57G205215G57轉(zhuǎn)換G10380G57。MAX232的G5049G1328電壓G2494G196685G57，內(nèi)部有G6403G14645電路G1147G10995正G171399G57電G1313。4系統(tǒng)的軟件設(shè)計41主程序設(shè)計ICL7135A/D與單片機G17842接電路的軟件設(shè)計系統(tǒng)的G12255G5219流G12255G3282G3926G3282G6164示。主G12255G5219一G5332G3999運行則設(shè)G13634堆棧起G3999G3332址G103870H，設(shè)G13634G1025斷G4504存器，用G7481對ICL7135的G1025斷進行計G6980，每5次G2530清零，G4448G6116一次G6980G6466采G19610G5049G1328，G9994G2530設(shè)G13634ICL71353G174G172G171液晶與89S52的接口G32823G175G171MAX232引G14062功能G3282A1A11的STB端的G1025斷的優(yōu)先G13435。緊接著LCDM1601B進行一次清屏，使其各個G6363令、G6980G6466G4504存器的G1552進行清G12366，屏幕G993顯示任何G4395符。以G2081面對1601B的介紹，G2494G16213將01HG17877G2052G6980G6466總線，使RSG320，R/G58G320，G40有個下降沿的G14045G1926就可以G4448G6116清屏G5049G1328。用以下G6363令G4466現(xiàn)MOG57P2,01HG17877G2052G6980G6466DB7DB0，調(diào)用G4388G12255G5219G40G49ABLG40，G11013于下降沿G7114，內(nèi)部G6980G6466G16213G17877G2052RAM區(qū)，G6164以G16213有一個延G7114G4388G12255G5219，使G17837個下降沿G6357G135052G175毫秒。內(nèi)部RAM有G6363令G1207碼G2530就G5332G3999對RAM進行清零，G6164以屏幕原有的G4395符將G15999清除。接著對1601進行功能的設(shè)定。MOG57P2,01111000B，G6365G159323G174G175G7481G11487G7171設(shè)定顯示器G63652行顯示，每行8G1313，57點陣。調(diào)用一次G4388G12255G5219G40G49ABLG40G12255G5219，G1901G1849CPU的G6363令G4504存器G1025。每次G2533LCDMG1025G1901G1849一個G6363令，就調(diào)用一次G40G49ABLG40，G9994G2530再對顯示器進行閃爍、光標(biāo)G12573功能進行設(shè)定。顯示器的RAMG3332址G6365G2164G717G7053G8873進行G16847G1901。再設(shè)定G12544一行G4395符，G1075就G7171G57OLTAGE的顯示G3332址80H。G4395符G57OLTAGE的TABLG40G15932G3332址G17877G2052DPTRG1025，G9994G2530調(diào)用G17840G12255查G15932G2641令，G1393次G6238G6980G6466G17877G2052P2口，G17837G7114再調(diào)用G4388G12255G5219G58RITG403，使LCD1601的RSG321，R/G58G320使使能端G40G1147G10995一個下降沿G14045G1926，將G6980G6466G17877G1849G2052G6980G6466G4504存器G1025，接下G7481執(zhí)行G4388G12255G5219DISPLAG601，G4439的主G16213功能G7171將TABLG40G15932G1025的G4395符G17767出G2052LCDG1025G2447。調(diào)定好顯示G4395符G6980G2375G17840G12255查G15932的次G6980，就G5332G3999查G15932了。例G3926G12544一個G4395符G256G57G257的ASCII碼G717156H，就將G17837個碼G17877G2052P2口，再調(diào)用使能G6980G6466G4388G12255G5219，使RSG321G708G6980G6466區(qū)使能G709G1901G1849顯示G6980G6466區(qū)，R/G58G320G15932示G1901，G40G32G7481個下降沿延G71142G175毫秒，使G6980G6466G1901G1849RAM內(nèi)。G4448G6116TABLG40G15932G17767出以G2530，G2533G6363令RAMG1025G1901G1849G125442行的起G3999G3332址G1038OCH，再調(diào)用顯示采樣G6980G6466的G4388G12255G5219。采樣G6980G6466存G6930的G6980G6466G3332址安排G3926下G3282G6164示,首先將60HG1025的G6980顯示在G32824G171G172G6980G6466G3332址G32824G171G171主G12255G5219流G12255G3282A1A12正G17139號的G1313G13634G990，G6365照ASCII碼G15932，正號G993顯示G70820HG709，G17139號顯示G256G257G7082DHG709。42A/D中斷程序設(shè)計G32824G172G171G1025斷G4388G12255G5219流G12255G3282A1A13ICL7135每一分G19059G4448G61163次G6466的采G19610G5049G1328，1/3秒G4448G6116G2530G2533CPU申請G1025斷,CPUG17837G7114暫停G5049G1328，G1038G1025斷服務(wù)G17G1025斷G2721應(yīng)G2530G1863G1025斷，將PSG58、ACC壓棧，判斷G7171否首次G1025斷，G3926G7536G7171首次G1025斷，則將正G17139號標(biāo)志G1313G13634G184960H，再G6238G987G1313G13634G184961HG1025，G3926G7536G993G7171首次G1025斷，則跳G2052G49G40XTG3800，G3926G7536G7171G12544二次G1025斷，則將G2327G1313G6980G13634G184962HG1025，G3926G7536G7171G12544三次G1025斷，再將G11346G1313G6980G13634G184963HG1025，G12544四次G1025斷則將G2325G1313G6980G13634G184964HG1025，G12544五次G1025斷則將小G6980點G1313G13634G184965HG1025，G2528G7114個G1313G13634G184966HG1025。G2528G7114清除G1025斷次G6980G4504存器30HG1025的G1552，G4448G6116G1025斷G2530將ACC、PSG58出棧，G5332G1025斷。消隱的思想每次電壓采G19610G2530，CPU將G6980G6466G17877G2052LCD顯示，將可能出現(xiàn)以下幾種G19668G16213消隱的G5785G1929。例G39262000G57G7735量G122550199G179G8504G7114G987G1313的G15520G993符合人G1216的視覺習(xí)慣，G19668G16213G6238G987G1313的G1552消隱G6493，G13546G12255G7171將20HG17877G1849G987G1313，使其在LCDG1025G993顯示任何G4395符G2375可。G2528樣的G5785G1929G3926下2000G57G7735量G122550019G1790001G179200G57G7735量G12255019G1799001G179920G57G7735量G1225501G17999在采G19610G2052G6980G6466G1055G2530，G13634G6980G1055G2081判斷G7735G1313，G71712G57G7735G993消隱，G7171其他G7735G1313G7114再G11487G16213消隱的G1313G1055G2081有幾個G7171零。例G39262000G57G7735量G12255，0001G179G57，在2次G1025斷G7114判斷G7735G1313G71712000G57G7735，G125441G1313G7171零，消隱G125442G1313G2327G1313。43通訊模塊程序設(shè)計89S52單片機內(nèi)部有一個G1852雙G5049的串行通信口，G2375串行接收和發(fā)G17877緩G1926器G708SBUG41G709，G17837兩個在物理G990獨立的接收發(fā)G17877器，既可以接收G6980G6466G1075可以發(fā)G17877G6980G6466。但接收緩G1926器G2494能G16847出G993能G1901G1849，G13792發(fā)G17877緩G1926器則G2494能G1901G1849G993能G16847出，G4439G1216的G3332址G103899H。G17837個通信口既可以用于網(wǎng)絡(luò)通信，亦可G4466現(xiàn)串行異步通信，G17836可以G7512G19668G16213消隱G987G1313、G2327G1313G19668G16213消隱G987G1313、G2327G13