基于单片机的LED广告屏设计的外文翻译

华北科技学院外文文献毕业论文（设计）外文翻译题目：基于AT89C51单片机的LED显示控制系统系部名称：电子信息工程学院专业班级：自动化B095学生姓名：张欣然学号：200903024503指导教师：黄佚教师职称:讲师2013年6月10日华北科技学院外文文献2本文摘译自：ApplicationofElectronicTechnique外文文献原文：DesignofLEDDisplayControlSystemBasedonAT89C52SingleChipMicrocomputerAbstract—ThispaperintroducesdisplaydesignprocessabouthardwareandsoftwarebasedonAT89C52singlechipmicrocomputer.Weuseasimpleexternalcircuittocontrolthedisplayscreen,whichsizeis32×192.Thedisplayscreenalsocandisplaythesizeofthesix32×32dotmatrixChinesecharactersbyadynamicscanmode,andcanbedividedintotwosmalldisplayscreen,whichcandisplaytwenty-fourChinesecharacterswhosesizeis16×16.Wecanmodifythecodetochangethecontentofthedisplay,subtitlescanachievescrollingfunctionandthescrollspeedcanbeadjustedaccordingtorequirements,subtitlescanalsoachievepausefunction.TheChinesecharactercodestoredinexternaldatamemory,thecapacityofdatamemoryisexpandedaccordingtotherequirementsofChinesecharacterswewanttoshow.Thisdisplayscreenhasadvantagesofsmallvolume,fewhardwareandsimplecircuitstructure.IndexTerms—LED,ChineseCharacterDisplay,AT89C52I.INTRODUCTIONLEDdisplayhasbecomeanimportantsymbolofthecitylighting,modernizationandinformationsocietywithcontinuousimprovementandbeautificationofpeople'slivingenvironment[6].LEDlightscanbeseeninthelargeshoppingmalls,railwaystation,docks,undergroundstation,avarietyofmanagementwindowandsoon.LEDbusinesshasbecomeafast-growingnewindustry,ahugemarketspaceandbrightprospects[9].Thetext,pictures,animationandvideoaredisplayedbyLED’slight,andcontentcanbechanged.Somecomponentsarethedisplaydevicesofthemodularstructure,andwhichusuallyconsistsofadisplaymodule,controlsystemandpowersystem.Thedisplaymoduleisconstitutedbythelatticestructurewhich华北科技学院外文文献3consistsofLED,andisresponsibleforlight-emittingdisplay;thescreencandisplaytext,pictures,videoandsoonbycontrolsystemwhichcancontrollightordarkofLEDinthecorrespondingregion;Powersystemisresponsiblefortransforminginputvoltageandcurrentintovoltageandcurrentwhichthescreenneeds.LEDdotmatrixdisplayextracteddisplaycharacterfontthroughPC,andsenttothemicrocontroller,thendisplayedinthedotmatrixscreen,whichmainlyusedfordisplayofindoorandoutdoorcharacters.LEDdotmatrixdisplaycanbedividedintographicdisplay,imagedisplayandvideodisplaybydisplayedcontent.Comparedwiththeimagedisplay,thecharacteristicsofgraphicdisplayisnodifferenceingraycolorwhetheritismonochromeorcolordisplay.Therefore,graphicdisplayalsofailstoreflecttherichnessofcolor,andvideodisplaycannotonlyshowexercise,clearandfull-colorimages,butalsoshowtelevisionandcomputersignals.Althoughtherearesomedifferencesbetweenthethree,butthemostbasicprinciplesaresimilar[6].SCMhasexcellentcostperformance,smallsize,highreliability,strongcontrol,andwidelyusedinsmartinstruments,mechanicalandelectricalintegration,realtimeprocesscontrol,robotics,domesticappliances,fuzzycontrol,communicationssystemsandsoon.ThisarticledescribedthedesignbytheLEDdisplayrelevantprinciple,andthedesignofhardwareandsoftwarestructurearedescribedindetail,finally,wesimulatefortheoveralldesignandanalyzetheresults.II.SystemOverallStructureDesignSingleChipMicrocomputer(SCM)modelswereselectedaccordingtothetarget,function,reliability,cost,accuracyandspeedofthecontrolsystem.Accordingtotheactualsituationofthesubject,thechoiceofSCMmodelsmainlyconsideredfromthefollowingtwoaspects:First,SCMhasstronganti-interferenceability;Second,SCMhasahighercost-effective.DuetoMCS-51iswidelyusedinChina,hasmoreinformationandcancompatiblewiththemoreperipheralchipstoo,inparticular,ATMELCorporation,introducedanewgenerationmicrocontrollerin2003,thatis89Sseries,anditstypicalproductswithhighperformanceandlowcostmicrocontrollerisAT89C52.AT89C52isalowvoltage,high-performanceCMOS华北科技学院外文文献48-bitmicrocontroller,thechipincludes8KBread-onlyprogrammemory(PEROM)whicherasecanberepeated,256byterandomaccessdatamemory(RAM),devicesadopthigh-densitynonvolatilememorytechnologytoproduce,compatiblewiththestandardMCS-51instructionsetandthe8052products,whilethechipbuilt-ingeneral-purpose8-bitcentralprocessing(CPU),Flashstorageunit,canbeappliedtothemorecomplexcontrolapplications[10].ThesystemwasrealizedbythecircuitrywhichismadeupofAT89C52chip,Clockcircuit,resetcircuit,columnscandrivercircuit,linedrivecircuitandthesix32×32LEDdotmatrix,theoverallstructureofLEDcharactersdisplayisshowninFig.1.Adisplayunitiscomposedofdotmatrixandtwo74HC154.Linedatasignalisdividedintotwoparts,whichisgivenbythetwo8255Arespectively,butthe8255AdataarefromtheP0portthemastercontrollerAT89C52.Thecolumnscanningsignalofeachcharacterwasgivenbythetwo74HC154,the74HC15412piecesandwasdividedintosixgroups.Theinputsignalof74HC154wasgivenbytheP1.0~P1.3ofAT89C52.Externaldatamemory6264connectedwiththeAT89C52theP0port.Figure1TheoverallstructureofLEDcharactersdisplayIII.SYSTEMHARDWARECIRCUITDESIGNA.CircuitDesignofMCUControlSystemThesizeofChinesecharactersis32×32,butmicrocontrollerhas32I/Oport,andcan’tmeetdesignrequirements,sotheI/Oportmustexpand,thedataportexpansionwasimplementedbytwo8255A.ThedataportexpansionisshowninFig.2,华北科