通信工程专业英语论文设计

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1、文档TheGeneralSituationofAT89C51TheAT89C51isalow-power,high-performanceCMOS8-bitmicrocomputerwith4KbytesofFlashProgrammableandErasableReadOnlyMemory(PEROM)and128bytesRAM.ThedeviceismanufacturedusingAtmel’shighdensitynonvolatilememorytechnologyandiscompatiblewit

2、htheindustrystandardMCS-51™instructionsetandpinout.Thechipcombinesaversatile8-bitCPUwithFlashonamonolithicchip;theAtmelAT89C51isapowerfulmicrocomputerwhichprovidesahighlyflexibleandcosteffectivesolutiontomanyembeddedcontrolapplications.Features:•Compatiblewit

3、hMCS-51™Products•4KBytesofIn-SystemReprogrammableFlashMemory•Endurance:1,000Write/EraseCycles•FullyStaticOperation:0Hzto24MHz•Three-LevelProgramMemoryLock•128x8-BitInternalRAM•32ProgrammableI/OLines•Two16-BitTimer/Counters•SixInterruptSources•ProgrammableSeri

4、alChannel•LowPowerIdleandPowerDownModesTheAT89C51providesthefollowingstandardfeatures:4KbytesofFlash,128bytesofRAM,32I/Olines,two16-bittimer/counters,afivevectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillatorandclockcircuitry.Inaddition

5、,theAT89C51isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.文档TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialportandinterruptsystemtocontinuefunctioning.ThePowerDownModesavestheRAMcontent

6、sbutfreezestheoscillatordisablingallotherchipfunctionsuntilthenexthardwarereset.BlockDiagramPinDescription:VCCSupplyvoltage.GNDGround.Port0：Port0isan8-bitopendrainbidirectionalI/Oport.AsanoutputporteachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thep

7、inscanbeusedashighimpedanceinputs.(Sink/flow)Port0mayalsobeconfiguredtobethemultiplexedloworderaddress/databusduringaccessestoexternalprogramanddatamemory.InthismodeP0has文档internalpull-ups.Port0alsoreceivesthecodebytesduringFlashprogramming,andoutputsthecodeb

8、ytesduringprogramverification.Externalpull-upsarerequiredduringprogramverification.Port1：Port1isan8-bitbidirectionalI/Oportwithinternalpull-ups.ThePort1outputbufferscansink/sourcefourTTLi