2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、DesignofLEDDisplayControlSystemBasedonAT89C52SingleChipMicrocomputerAbstract—ThispaperintroducesdisplaydesignprocessabouthardwaresoftwarebasedonAT89C52singlechipmicrocomputer.Weuseasimpleexternalcircuittocontrolthedispla

2、yscreenwhichsizeis32192.Thedisplayscreenalsocandisplaythesizeofthesix3232dotmatrixChineseactersbyadynamicscanmodecanbedividedintotwosmalldisplayscreenwhichcandisplaytwentyfourChineseacterswhosesizeis1616.Wecanmodifytheco

3、detochangethecontentofthedisplaysubtitlescanachievescrollingfunctionthescrollspeedcanbeadjustedaccdingtorequirementssubtitlescanalsoachievepausefunction.TheChineseactercodestedinexternaldatamemythecapacityofdatamemyisexp

4、edaccdingtotherequirementsofChineseacterswewanttoshow.Thisdisplayscreenhasadvantagesofsmallvolumefewhardwaresimplecircuitstructure.IndexTerms—LEDChineseacterDisplayAT89C52I.INTRODUCTIONLEDdisplayhasbecomeanimptantsymbolo

5、fthecitylightingmodernizationinfmationsocietywithcontinuousimprovementbeautificationofpeopleslivingenvironment[6].LEDlightscanbeseeninthelargeshoppingmallsrailwaystationdocksundergroundstationavarietyofmanagementwindowso

6、on.LEDbusinesshasbecomeafastgrowingnewindustryahugemarketspacebrightprospects[9].ThetextpicturesanimationvideoaredisplayedbyLED’slightcontentcanbechanged.Somecomponentsarethedisplaydevicesofthemodularstructurewhichusuall

7、yconsistsofadisplaymodulecontrolsystempowersystem.ThedisplaymoduleisconstitutedbythelatticestructurewhichconsistsofLEDisresponsibleflightemittingdisplaythescreencandisplaytextpicturesvideosoonbycontrolsystemwhichcancontr

8、ollightdarkofLEDinthecrespondingregionPowersystemisresponsibleftransfminginputvoltagecurrentintovoltagecurrentwhichthescreenneeds.LEDdotmatrixdisplayextracteddisplayacterfontthroughPCsenttothemicrocontrollerthendisplayed

9、inthedotmatrixscreenwhichmainlyusedfdisplayofindooutdoacters.LEDdotmatrixdisplaycanbedividedintographicdisplayimagedisplayvideodisplaybydisplayedcontent.Comparedwiththeimagedisplaytheacteristicsofgraphicdisplayisnodiffer

10、enceingraycolwhetheritismonochromecoldisplay.Therefegraphicdisplayalsofailstoreflecttherichnessofcolvideodisplaycannotonlyshowexerciseclearfullcolimagesbutalsoshowtelevisioncomputersignals.Althoughtherearesomedifferences

11、betweenthethreebutthemostbasicprinciplesaresimilar[6].Figure1TheoverallstructureofLEDactersdisplayIII.SYSTEMHARDWARECIRCUITDESIGNA.CircuitDesignofMCUControlSystemThesizeofChineseactersis3232butmicrocontrollerhas32IOptcan

12、’tmeetdesignrequirementssotheIOptmustexpthedataptexpansionwasimplementedbytwo8255A.ThedataptexpansionisshowninFig.274HC373istheaddresslatchlatchloweightaddresstheloweightaddresssignalsof6264providedbyitbutthehigheightadd

13、resssignalsof6264providedbyP2.0~P2.4Internalptof8255AwaschosenbyA0A1.74HC139is24decoderwhoseinputsignalsareprovidedbyP2.6P2.7ofSCMprovidedstrobeftheexternalIOdevicesbecausethesystemhasmethanoneexternaldevicemakesurethatt

14、heycannotbegatedsothattheiraddressesistheonlydonotrepeat.TheclockcircuitofAT89C52composedof1819feetfromtheclockside(XTALIXTAL2)12MHzcrystalXcapacitC1C2usesonchiposcillatmode.Resetcircuitusesasimplepoweronresetcircuitmain

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