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山东理工大学毕业设计（外文翻译材料）学院：专业：学生姓名：指导教师：电气与电子工程学院电子信息工程刘晓阳王雅静外文翻译（原文）-1-BasedonSCMmulti-functionaltemperaturetestingsystemdesign1、PrefaceWiththedevelopmentofsocietyandthetechnologicalprogress,peoplepaymoreandmoreattentiontotheimportanceoftemperaturedetectionanddisplay.Temperaturedetectionandstatusdisplaytechnologyandequipmenthasbeenwidelyappliedinindustries,productsonthemarketemergeinendlessly.Temperaturetestingandalsograduallyadopttheautomaticcontroltechnologytorealizethemonitor.Thistopicisatemperaturetestingandstatusofthemonitoringsystem.2、SystemsolutionsThissystemUSESthemonolithicintegratedcircuitAT89C51asthissystem.Thewholesystem,thehardwarecircuitincludingpowersupplycircuit,sensor,thetemperaturedisplaycircuitcircuit,upperalarmcircuit.Thealarmingcircuitcanbemeasuredinuppertemperaturerange,screamingvoicealarm.ThebasicprincipleforthetemperaturecontrolDSl8B20:whenthetemperaturesignalacquisitiontoaftertemperaturesignalsenttohandle,AT89C51temperaturetoLCDscreen,SCMaccordingtoinitializetheuppertemperaturesetting,namely,ifthejudgementoftemperaturethanthehighesttemperaturecoolingfanisstarted,Ifthetemperatureislessthanthelowesttemperaturesettingonalarmdevice.3、Thesystemhardwaredesign（1）AT89C51SCMareintroducedTheAT89C51isalow-power,high-performanceCMOS8-bitmicrocomputerwith4KbytesofFlashprogrammableanderasablereadonlymemory(PEROM)and128bytesofdatarandom-accessmemory(RAM).ThedeviceismanufacturedusingATMELCo.’shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindustry-standardMCS-51instructionsetandpin-out.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8-bitCPUwithFlashonamonolithic外文翻译（原文）-2-chip,theATMELCo.’sAT89C51isapowerfulmicrocomputerwhichprovidesahighly-flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.Features:·CompatiblewithinstructionsetofMCS-51products·4Kbytesofin-systemreprogrammableFlashmemory·Endurance:1000write/erasecycles·Fullystaticoperation:0Hzto24MHz·Three-levelprogrammemorylock·128×8-bitinternalRAM·32programmableI/Olines·Two16-bitTimer/Counters·Sixinterruptsource·Programmableserialchannel·Low-poweridleandPower-downmodesFunctionCharacteristicDescription:TheAT89C51providesthefollowingstandardfeatures:4KbytesofFlashmemory,128bytesofRAM,32I/Olines,two16-bittimer/counters,afivevectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillatorandclockcircuitry.Inaddition,theAT89C51isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialportandinterruptsystemtocontinuefunctioning.ThePower-downModesavestheRAMcontentsbutfreezestheoscillatordisablingallotherchipfunctionsuntilthenexthardwarereset.PinDescription:·VCC:Supplyvoltage外文翻译（原文）-3-·GND:Ground·Port0:Port0isan8-bitopen-drainbi-directionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashighimpedanceinputs.Port0mayalsobeconfiguredtobethemultiplexedloworderaddress/busduringaccessestoexternalprogramanddatamemory.InthismodeP0hasinternalpullups.·Port0alsoreceivesthecodebytesduringFlashprogramming,andoutputsthecodebytesduringprogramverification.Externalpullupsarerequiredduringprogramverification.·Port1:Port1isan8-bitbidirectionalI/Oportwithinternalpullups.ThePort1outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort1pinstheyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port1pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseoftheinternalpullups.Port1alsoreceivesthelow-orderaddressbytesduringFlashprogrammingandverification.·Port2:Port2isan8-bitbi-directionalI/Oportwithinternalpullups.ThePort2outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort2pinstheyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port2pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseoftheinternalpullups.Port2emitsthehigh-orderaddressbyteduringfetchesfromexternalprogrammemoryandduringaccessestoexternaldatamemorywhichuses16-bitaddresses(MOVX@DPTR).Inthisapplication,itusesstronginternalpullupswhenemitting1s.Duringaccessestoexternaldatamemorywhichuses8-bitaddresses(MOVX@RI).外文翻译（原文）-4-Port2emitsthecontentsoftheP2SpecialFunctionRegister.Port2alsoreceivesthehigh-orderaddressbitsandsomecontrolsignalsduringFlashprogrammingandverification.·Port3:Port3isan8-bitbi-directionalI/Oportwithinternalpullups.ThePort3outputbufferscansink/sourcefourTTLinputs.When1sarewrittentoPort3pinstheyarepulledhighbytheinternalpullupsandcanbeusedasinputs.Asinputs,Port3pinsthatareexternallybeingpulledlowwillsourcecurrent(IIL)becauseofthepullups.Port3alsoreceivessomecontrolsignalsforFlashprogrammingandverification.·RST:Resetinput.Ahighonthispinfortwomachinecycleswhiletheoscillatorisrunningresetsthedevice.·ALE/PROG:AddressLatchEnableoutputpulseforlatchingthelowbyteoftheaddressduringaccessestoexternalmemory.Thispinisalsotheprogrampulseinput(PROG)duringFlashprogramming.Innorm