基于51单片机的电子数字钟的设计与实现的外文翻译

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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•SixInterruptSources•Progr

2、ammableSerialChannel•Low-powerIdleandPower-downModes2.DescriptionTheAT89C51isalow-power,high-performanceCMOS8-bitmicrocomputerwith4KbytesofFlashprogrammableanderasablereadonlymemory(PEROM).ThedeviceismanufacturedusingAtmel’shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindustry-st

3、andardMCS-51instructionsetandpin-out.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8-bitCPUwithFlashonamonolithicchip,theAtmelAT89C51isapowerfulmicrocomputerwhichprovidesahighly-flexibleandcost-effectivesolutiontom

4、anyembeddedcontrolapplications.3.PinConfigurations4.LockDiagramTheAT89C51providesthefollowingstandardfeatures:4KbytesofFlash,128bytesofRAM,32I/Olines,two16-bittimer/counters,afivevectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillatorandclockcircuitry.Inaddition,theAT89C51is

5、designedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialportandinterruptsystemtocontinuefunctioning.ThePower-downModesavestheRAMcontentsbutfreezestheoscillatordisablingallotherchipfuncti

6、onsuntilthenexthardwarereset.5.PinDescriptionVCC:Supplyvoltage.GND:Ground.Port0:Port0isan8-bitopen-drainbi-directionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashigh-impedanceinputs.Port0mayalsobeconfiguredtobethemultiplexedlow-orderaddress/

7、databusduringaccessestoexternalprogramanddatamemory.InthismodeP0hasinternalpull-ups.Port0alsoreceivesthecodebytesduringFlashprogramming,andoutputsthecodebytesduringprogramverification.Externalpull-upsarerequiredduringprogram