自动化专业基于单片机的LED显示屏的设计与Proteus仿真外文文献翻译及原文Word文档格式.docx

自动化专业基于单片机的LED显示屏的设计与Proteus仿真外文文献翻译及原文Word文档格式.docx

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翻译日期:

2017.02.14

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英文原文

LEDDisplayScreenDesignandProteusSimulationBasedonSingle-ChipMicrocomputer

Abstract—ThispaperdesignsaLEDdisplaysystemcontrolledbyAT89C52MCU（MicrocomputerControllerUnit）.TheAT89C52controlstheexternalcircuitformedby74HC154andusedtocontroltherealtimedisplay.LanguageCisappliedtocompileprograminKeiluVision3programmingenvironment.ThedisplaysystemissimulatedthroughProteussoftware.InProteusenvironment，theschematicdiagramisdrawn.Throughstimulation，itachievesreal-timedisplay,staticdisplayanddynamicdisplayofChinesecharacters.Ithasswitchkeystochangedisplaystateofdetails.Throughtheactualsimulation，thebiggestcontrollablescreensizeoftheAT89C52MCUis64x32.TheAT89C52controlstheentirescreendisplayofChinesecharactersof16x16dotmatrix,atotalofeightcharacters.Andthekeyfunctioncanbeextended.

Keywords-LEDdisplay;

AT89C52;

Proteus;

dynamicscanning

I.INTRODUCTION

Energy-savingissueattractseveryone5sattention.Thustheproductsthatfocusonenergyconservationgetmorerecognition.LED（LightEmittingDiode-LED）displayproducedinthe1970swhenitwassimplyusedtodisplaynumberandtext.WiththediversificationofLedcolorsandenhancementofbrightness，fullcoloroutdoorsLEDdisplaybecamearealityattheendofthe20thcentury.TheLEDofourcountryappearedinthe1970sanditsindustrialproductioninthe1980s.ThedevelopmentofinformationandadvertisingindustrybringsabouttheemergenceofLEDdisplayscreen.LEDdisplayscreensaremainlyusedinadvertisingwindow,trainstations,banksandotherplaces.Itgetsmoreandmorewidelyused.Itsowncharacteristicscouldmakeitoccupyamarketinthedisplayscreenindustryinthefuture.

InthedesignofLEDdisplay,thehardestpartishardwaredebug.Inorderto

soIvethesignaIinterference,insufficientsoIderinhardwareconnection,componentdamageandaseriesofdebuggingproblems,theEDA（ElectronicDesignAutomation-EDA）utilitysoftwareProteusthattheUKLabcentereIectronicscompanyresearchedcanbeusedtorealizetheentirehardwaresystemschematicdrawingandsimulation[1].

ProteussimulationenvironmentincludesISISandARES.IntheISISenvironment，electroniccircuitcanbedirectlystimulatedinthestageofschematic.Italsoprovidesvirtualmachines,simulationoftheinputsignalwhichmakesaconvenientsimulation.ARESismainlyusedforPCB（PrintedCircuitBoard-PCB）design.Thedevicelibraryprovidesschematicdeviceanditspackage.Itcandesignprintedcircuitboardin

thisenvironment.

ProteussimulationsystemcurrentlysupportsMCU（MicroControlIerUnit-

MCU）withARM7,8051/52series,AVRseries,PIC10/12/16/18series,HC11seriesandtheMSP430[2].Itcanobservethedirectresultofhardwaredebugwithproteussimulation.Ithasthecharacterssuchasintuitive,convenient,costsavings,highefficiencyandsoon.

II.THEDESIGNOFLEDDISPLAY

LEDdisplaysystemisformedbyMCU,LEDscreendisplaycircuit,externaIcircuitandtheprogramforcontrolthesystem.LEDscreendisplaycircuitincludesLEDpaneIandthedrivingcircuitofrowandcolumn.TheexternaIfunctioncircuitincludeskeycontrollingcircuitandreaI-timeclockcircuit.DisplayfunctioncanbeachievedasfolIows:

numbers,characters,Chinesecharacters,staticdisplayofmonochromepictures,anddynamicdisplay.DynamicdisplayincIudesthewholedisplaycontentmovingupandIeft.Theshiftmethodiscontrolledbykeys,andalsobyautomaticcycle.Thesystemofreal-timeclockdisplayprovidesseconds,minutes,hours,day，date,month,andyearinformation.TheoverallblockdiagramofLEDdisplayscreenisshowninFig.1.

F^ure1.TheoverallblockdiagramofLEDdisplayscreen

III. HARDWAREDESIGNOF

LEDDISPLAY

A.DesignofRowDriving

Circuit

ThecoreofLED

displaysystemisthecontrol

circuit.The

controlcircuit

includesdrivingcircuit,clockcircuitandthesmallestMCUsystemwhichconsistsofAT89C52MCU,CrystalosciIIatorcircuitandresetcircuitRowdrivingchipis74HG154,4-to-16Iinedecoder/demultiplexer,activeLOWoutputs.

P2.0~P2.3portofAT89C52connecttoA0~A3of74HC154decoder.Accordingtotheoperatingprincipleofthedecoder,whentheMCUsystemcontrolsitsP2portoutput0x00~0x0F，the74HC154respectiveIy

L如Al沁A3]

IVDLlglIYllggIYtIY5IY5IYyl^giggIYDIYBIY14JI

丽Y0YlY2Y3Y4Y5Y6Y7l710711^Y14^

IB

PJXI

PJJ

PJ3

outputLOWIeveIfromYOtoY15.AndthenthefirstIinetothesixteenthlineofdisplayscreenisselected.TheP2.4portofMCUconnec