红外发射和接收电路设计外文翻译Word文档下载推荐.docx
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Infraredremotecontrolsystemismainlycomposedbytheremotecontroltransmitter,integratedreceiverhead,microcontroller,interfacecircuitshowninFigure1.Theremotecontrolisusedtogeneratetheremoteencoderpulsedriveinfraredemissioncontroloutputoftheinfraredremotecontrolsignal,theremotecontrolreceiverontheremotecontrolsignalamplification,detection,shaping,demodulationremoteencoderpulse.Theremotecontrolencoderpulseisaserialbinarycodefortheinfraredremotecontrolsystem,theserialcodeinputtothemicrocontroller,itsinternalCPUinstructiondecodeontheremotecontrol,andperformremotecontrolfunctions.Usingtheremotecontrolastheinputofthecontrolsystem,weneedtoaddressthefollowingkeyquestions:
howtoreceivetheinfraredremotecontrolsignal;
howtoidentifytheinfraredremotecontrolsignal,anddecodingsoftwaredesign,designofcontrolprocedures.
SCMhistory
SCMwasbornin1971,hasgonethroughthreemajorphasesoftheSCM,theMCUSoC.Itconsistsofcomputingdevice,controller,memory,inputoutputdevices.Itsfullnameisasingle-chipmicrocomputer,istypicalofembeddedmicro-controller(MicrocontrollerUnit),thecommonlyusedlettersoftheabbreviationMCUsingle-chip,anditwasfirstusedinthefieldofindustrialcontrol.Mastermicrocontrollertechnologytoenablemorepeopleintheindustry,students,enthusiasts,productdevelopers,thequestionaroseduetotheextensiveapplicationofSCMinthefieldofindustrialcontrol,microcontrollerdevelopmentboard,themorefamoussuchase-DZR-01Amicrocontrollerdevelopmentboard.MicrocontrollerchipdedicatedprocessordevelopedfromtheCPU.ThefirstdesignconceptbyalargenumberofperipheralsandCPUintegratedinasinglechip,thecomputersystemissmaller,moreeasilyintegratedintocomplexandrequirestrictcontrolequipmentonthevolume.Single-chip,alsoknownassingle-chipmicrocontroller,itisnotthecompletionofalogicalfunctionofthechip,butacomputersystemintegratedontoonechip.Equivalenttoamini-computerandcomputer,microcontrolleronlythelackofI/Odevices.SCMrelyontheprogramisrunning,andcanbemodified.Differentfunctionsthroughdifferentprograms,especiallythespecialuniquefunction,whichistheotherdevicesrequiremuchefforttodo,whileothersmakegreateffortsitisdifficulttodo.Anotverycomplexfunctionsusingpurehardwaretogetthewordsofthe1950sdeveloped74series,or60duringtheCD4000series,thecircuitmustbeabigPCBboard!
IfsuccessfulonthemarketintheUnitedStatesinthe1970sseriesofmicrocontrollers,theresultwillbedifferent!
JustbecauseaprogramwrittenbytheMCUthroughyoucanachievehighintelligence,highefficiencyandhighreliability!
Microcontrollerforcostsensitive,soaccountingforthedominanceofthesoftwareorthelowestlevelassemblylanguage,whichisthelowestlevelthanbinarymachinecodelanguage,sincesuchlow-levelwhyuseit?
Alotofhigh-levellanguagehasreachedalevelofvisualprogramming,whynot?
Thereasonissimple,isthemicrocontrollerdoesnothaveahomecomputerastheCPU,alsonotashardasmassstoragedevices.Avisualhigh-levellanguagetowritesmallprogramsinsideevenifthereisonlyonebutton,willreachtensofKofsize!
NothingintermsofhomePC'
sharddrive,butforSCMintermsofisnotacceptable.SCMintheutilizationofhardwareresourcesmustbehigh,sothecompilationoftheoriginalwhilestillinheavyuse.Thesamereason,ifthecomputergiant'
soperatingsystemandapplicationsoftwaretogethomePCrunuptothehomePCcannotafford.
Itcanbesaidthatthetwentiethcenturyacrossthethree"
power"
eraoftheelectricalera,theelectronicageandhasnowenteredthecomputerage.However,suchacomputer,usuallyreferstoapersonalcomputer,orPC.Itisbythehost,keyboard,monitor,andsoon.Anothertypeofcomputer,nothowmostpeoplearefamiliarwith.Thiscomputerissmarttogiveavarietyofmechanicalmicrocontroller(alsoknownasmicro-controller).Thenamesuggests,thesmallestofthiscomputersystemusingonlyoneICtomakeasimplecalculationandcontrol.Becauseofitssmall,usuallyhiddeninacontrolledmechanical"
stomach"
.Throughoutthedevice,itplaysliketheroleofthehumanmind,itiswrong,theentiredevicewasparalyzed.Now,thissinglechipfieldofusehasaverywide,suchassmartmeters,real-timeindustrialcontrol,communicationsequipment,navigationsystems,homeappliancesandsoon.AvarietyofproductsusingtheSCM,youcanplaytheeffectofproductupgrades,oftenprecededbyanadjectiveinfrontoftheproductname-"
smart"
suchassmartwashingmachines.Somefactoriesorotheramateurelectronicsdeveloperstoengageinoutofcertainproducts,notthecircuitistoocomplicated,toosimpleandcaneasilybeimitation.Thereasonmaybestuckintheproductdoesnotuseamicrocontrollerorotherprogrammablelogicdevices.
Microcontrollerapplications
MCUtoinfiltrateallareasoflife,almostdifficulttofindwhichareasofthemicrocontrollertrail.Navigationdeviceofthemissile,aircraft,variousinstrumentcontrol,computernetworkcommunicationsanddatatransmission,industrialautomationandprocessreal-timecontrolanddataprocessing,widelyusedsmartcardIC,civilluxurycarsecuritysystem,VCR,cameras,thecontrolofautomaticwashingmachines,andprogram-controlledtoys,electronicpets,etc.,whichareinseparablefromthemicrocontroller.Nottomentionthefieldofautomaticcontrol,robotics,intelligentinstruments,medicalequipment.Therefore,thelearning,developmentandapplicationoftheSCMwillcreateanumberofcomputerapplicationsandintelligentcontrolofthescientists,engineers.
Themicrocontrolleriswidelyusedinthefieldofinstrumentation,homeappliances,medicalequipment,aerospace,equipmentfortheintelligentmanagementandprocesscontrol,generallycanbedividedintothefollowingcategories:
1.Onsmartinstrumentation
Themicrocontrollerhasasmallsize,lowpowerconsumption,andcontrolfunctions,andexpansionoftheadvantagesofflexibility,miniaturizationandeasytouse,widelyusedininstrumentation,combinedwithdifferenttypesofsensorscanberealizedsuchasvoltage,power,frequency,humidity,temperature,flow,speed,thickness,angle,length,hardness,elements,pressureandotherphysicalmeasurement.SCMmakesthedigitalinstrumentation,intelligent,miniaturizationandmorepowerfulfunctionthantheuseofelectronicordigitalcircuits.Suchasprecisionmeasuringequipment(powermeter,oscilloscope,analyzer).
2.Inindustrialcontrolapplications
MCUcanconstitutevariousformsofcontrolsystems,dataacquisitionsystems.Suchasfactoryassemblylineofintelligentpipe
3.inHouseholdAppliances
ItcanbesaidofhomeappliancesisbasicallyusingtheMCUcontrol,electricricepraise,washingmachines,refrigerators,airconditioners,colorTVs,andotheraudiovideoequipment,thentheelectronicweighingequipment,varied,omnipresent.
4.inthefieldofcomputernetworksandcommunication
Modernmicrocontrollerwithuniversalcommunicationinterfacecanbeeasilyandcomputerdatacommunications,providesexcellentmaterialforuseincomputernetworksandcommunicationdevices,communicationequipmentbasicallytotheMCUintelligentcontrolfromthemobilephones,telephones,smallprogram-controlledswitchboards,buildingautomatedcommunicationscallsystems,trainradiocommunications,andthentotheubiquitousmobilephonesintheirdailywork,trunkingmobilecommunicationradios.
5.Chipinthefieldofmedicalequipment
Themicrocontrollerusesinmedicaldevicesisalsoquiteextensive,suchasmedicalventilator,avarietyofanalyzers,monitors,ultrasounddiagnosticequipmentandhospitalbedscallsystemandsoon.
6.Modularapplicationsinavarietyoflargeappliances
Somededicatedmicrocontrollerdesignedforspecificfunctions,modularapplicationsinavarietyofcircuit,withoutrequiringtheuseofpersonneltounderstanditsinternalstructure.Integratedsingle-chip,suchasmusic,seeminglysimplefunction,miniaturepureelectronicchip(asopposedtotheprincipleofthetapedrive),youneedacomplexsimilartotheprincipleofthecomputer.Suchas:
themusicsignalindigitalforminmemory(similartotheROM),readbythemicrocontrollerintoanalogmusicsignal(similartothesoundcard).
Inlargecircuits,thismodularapplicationgreatlyreducethesize,simplifyingthecircuit,reducingthedamage,errorrate,isalsoconvenienttoreplace.
7.Chipinthefieldofautomotiveequipment
Themicrocontrolleriswidelyusedinautomotiveelectronics,suchasautomotiveenginecontrollers,intelligentelectroniccontrollerbasedonCANbusautomotiveengine,GPSnavigationsystem,absanti-locksystems,brakingsystems,etc..
Inaddition,themicrocontrollerbusiness,finance,scientificresearch,education,defense,aerospaceandotherfieldshasaverywiderangeofapplications,microcontrollerdevelopmentprospectsareveryobjective.
Speakingingeneralterms:
theMCU'
ssmallsize,lightweight,inexpensive,andprovidefavorableconditionsforlearning,applicationanddevelopment.Atthesametime,learningtousethemicrocontrolleristhebestchoicefortheunderstandingofcomputertheoryandstructure.SCMisthebestchoiceforpeopletostudyandapplicationofrelatedtechnologies.
MasterchipAT89S51
TheAT89S51ATMELCorporationintheUnitedStateslow-power,high-performanceCMOS8bitmicrocontroller,on-chipcontaining4kbytesofsystemprogrammingofflashread-onlyprogrammemory,thedevi