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》由会员分享,可在线阅读,更多相关《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(11页珍藏版)》请在冰豆网上搜索。
文献、资料来源:
文献、资料发表(出版)日期:
指导教师:
翻译日期:
2017.02.14
院 (部)
专 业:
自动化班 级:
姓 名:
学 号:
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