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ThedevelopmentandapplicationofMCS-51MCS-51single-chipwasproductedintheUnitedStatesINTEcompaniesin1980,andcomparedwithMCS-48single-chipthestructureofithasmoreadvancedandmorepowerful,intheoriginalbasisofthecircuitanincreaseofmoreunitsanddirectiveamountedto111,MCS-51singlechipcanberegardedasverysuccessfulproduct,untilnow,MCS-51seriesorcompatiblesingle-chipapplicationsisstillthemainstreamproduct,collegesanduniversitiesandprofessionalschools,trainingmaterialsremainedinlinewiththeMCS-51single-chip,asthetheoreticalfoundationforlearning.Wealsocarryouttherepresentationofsystemmodelstoexplain.TherangeofMCS-51single-chip8031,8051and8751mainlyincludesproductssuchasGM,itsmainfunctionisasfollows:8-bitCPU4kbytesprogrammemory(ROM)128bytesofdatamemory(RAM)32ArticleI/Oport111commandline.Mostofthe21single-byteinstructionregister2dedicatedprogrammabletimer/counterinterruptsource5,atwo-priority,full-duplexserialcommunicationporttoexternaldatamemoryaddressspaceforexternal64kBprogrammemoryaddressspacefor64kB-bitaddressinglogicoperationfunction40PinDIPdualin-linepackageSingle+5VPowerSupplyMCS-51withitstypicalstructureandimprovethespecialregistersofthebuscentralizedmanagement,operationofalargenumberoflogicfunctionsandbit-orientedcontrolrichinstructionset,calledforthegenerationofcrew,theothersingle-chipmicrocomputerforlaterlaidthefoundationforthedevelopment.Becauseofitssuperiorperformanceandimprovethestructure,resultinginthesubsequentmanymanufacturersuseormakereferencetomorethanitsarchitecture,therearemanyoftheworld'slargestmakerofelectricalandenrichedanddevelopedtheMCS-51microcontroller,suchasPHILIPS,Dallas,ATMEL,etc.well-knownsemiconductorcompaniesarecompatiblewiththeintroductionoftheMCS-51microcontrollerproducts,andevenChina'sTaiwanWINBONDalsocompatiblewiththedevelopmentofC51(itusedtobereferredtoasMCS-51IfthereisnospecialstatementC51,bothwiththemeanMCS-51Seriessingle-chip)microcontrollervarieties.C51obtainedinrecentyearsthedevelopmentofrapid,C51originINTELasaresultofthecompanywasbusydevelopinghigh-endPCandnotonthemicroprocessortocontinuetodeveloptheirownsingle-chip,andbyothermanufacturerstoitsdevelopment,isthemosttypicalPHILIPSandATMLcompany,PHILIPSmainlytoimproveitsperformance,basedontheoriginaldevelopmentofthehigh-speedI/Oport,A/Dconverter,PWM(pulsewidthmodulation),WDTandotherenhancements,andlow-voltage,micro-powerconsumption,extendedserialbus(I2C)andcontrolnetworkbus(CAN)andotherfunctionsbeimproved.PHILIPSCorporationC51inthedevelopmentoflow-power,highspeedandenhancedfunctionalitymademanycontributionstothedevelopmentofitsfirstmajorC51single-chip,theysave83Cxxand87Cxxseriesofparallelexpansionbus,suitableforcontrolofhouseholdappliancesasacategoryofsingle-chipmicrocomputeroftheeconomy.ATMELCorporationAT89CxxintroducedC51rangeofcompatiblesingle-chip,tobeperfectlyFlash(non-volatileflashmemorytechnology)EEPROMwith80C51corecombinetheuseofC51isstilltheoverallstructureandcommandsystem,Flashcanbeanti-erasableprogrammemorycaneffectivelyreducethedevelopmentcostsandallowforrepeateduseofsingle-chipmicrocomputer.SiemensalsousethecoreofC51,C500serieshasintroducedsingle-chip,whilemaintainingcompatibilitywiththeC51instructionsunderthepremiseoftheperformanceoftheirproductshasbeenfurtherimproved,especiallyintheanti-interferenceperformance,electromagneticcompatibilityandcommunicationcontrolbusuniquefunctions,andtheirproductsarecommonlyusedintheworkingenvironmentoftheoccasion.Alsoappliestothefieldoftelecommunicationsandhomeappliancecontrol.WINBONDTaiwancompanieshavealsodevelopedaseriesofC51-compatiblemicrocontroller,anditsproductstypicallyhaveawealthoffeatures,butalsotoitshighqualityandlowpriceinthemarketalsohasacertainamountofpoints.8051isMCS-51seriessingle-chiprepresentationofproducts.Itintegratedapowerfulcentralprocessingunit,includingtheinstrumentsusedinmultiplicationanddivisionhardware,controlregisters21dedicated,4kBtheprogrammemory,128bytesofdatamemory,4groupsof8parallelport,two16-bitcanbeprogrammingtimer/counter,afull-duplexserialport,aswellastheBooleanprocessor.MCS-51hasarelativelylargeaddressspace,addresslinewidthof16,orexternaldatamemoryandprogrammemoryaddressinganareaof216=64kB,whichiscontrolledasasingle-chipisrelativelylarge,whichatthesametimeavailableontheI/Oportaccess.Inaddition.MCS-51modularstructure,canbeeasilyaddedtoanddeletedamoduleandinstructionscanbepin-compatibleproducts.Thuseasytoformaserializedproducts.MCS-51asaresultofthealmostperfectintegrationofthe8-bitcentralprocessingunit,processing,andcentralprocessingunitinaconvenientandflexibleintegrationofadedicatedregister,thehardwareincreases,subtraction,multiplication,division,andBooleanlogicprocessorandavarietyofcomputingandtransferofcommand,whichwillprovideagreatconvenience.MCS-51instructionsetofnear-perfectcommandsystemcontainscomprehensivedatatransferinstructions,andimproveoperationsofarithmeticandlogicinstructions,easytooperateandcontrolthelogicofcommands,theprogrammingisveryflexibleandconvenient.MCS-51single-chipoperatefrequencyisthe2-12MHz,whentheoscillationfrequencyis12MHz,