AT89C51系列用户指南-外文翻译

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1、AT89C51FamilyUser’sGuide1.Features•CompatiblewithMCS-51™Products•4KBytesofIn-SystemReprogrammableFlashMemory–Endurance:1,000Write/EraseCycles•FullyStaticOperation:0Hzto24MHz•Three-levelProgramMemoryLock•128x8-bitInternalRAM•32ProgrammableI/OLines•Two16-bitTimer/Counters•SixInterru

2、ptSources•ProgrammableSerialChannel•Low-powerIdleandPower-downModes2.DescriptionTheAT89C51isalow-power,high-performanceCMOS8-bitmicrocomputerwith4KbytesofFlashprogrammableanderasablereadonlymemory(PEROM).ThedeviceismanufacturedusingAtmel’shigh-densitynonvolatilememorytechnologyand

3、iscompatiblewiththeindustry-standardMCS-51instructionsetandpin-out.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8-bitCPUwithFlashonamonolithicchip,theAtmelAT89C51isapowerfulmicrocomputerwhichprovide

4、sahighly-flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.3.PinConfigurations4.LockDiagramTheAT89C51providesthefollowingstandardfeatures:4KbytesofFlash,128bytesofRAM,32I/Olines,two16-bittimer/counters,afivevectortwo-levelinterruptarchitecture,afullduplexserialpor

5、t,on-chiposcillatorandclockcircuitry.Inaddition,theAT89C51isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialportandinterruptsystemtocontinuefunctioning.ThePower-do

6、wnModesavestheRAMcontentsbutfreezestheoscillatordisablingallotherchipfunctionsuntilthenexthardwarereset.5.PinDescriptionVCC:Supplyvoltage.GND:Ground.Port0:Port0isan8-bitopen-drainbi-directionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinsc

7、anbeusedashigh-impedanceinputs.Port0mayalsobeconfiguredtobethemultiplexedlow-orderaddress/databusduringaccessestoexternalprogramanddatamemory.InthismodeP0hasinternalpull-ups.Port0alsoreceivesthecodebytesduringFlashprogramming,andoutputsthecodebytesduringprogramverification.Externa

8、lpull-upsarerequiredduringprogram