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1、沈阳农业大学学士学位论文外文翻译外文原文AT89S52Features•CompatiblewithMCS-51®Products•8KBytesofIn-SystemProgrammable(ISP)FlashMemory•1000Write/EraseCycles•FullyStaticOperation:0Hzto33MHz•Three-levelProgramMemoryLock•256x8-bitInternalRAM•32ProgrammableI/OLines•Three16-bitTimer/Counters•EightInterruptS
2、ources•FullDuplexUARTSerialChannel•Low-powerIdleandPower-downModes•InterruptRecoveryfromPower-downMode•WatchdogTimer•DualDataPointer•Power-offFlagDescriptionTheAT89S52isalow-power,high-performanceCMOS8-bitmicrocontrollerwith8Kbytesofin-systemprogrammableFlashmemory.Thedeviceismanu
3、facturedusingAtmel’shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindustrystandard80C51instructionsetandpinout.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8-bitCPUwithinsystemprogram
4、mableFlashonamonolithicchip,theAtmelAT89S52isapowerfulicrocontrollerwhichprovidesahighly-flexibleandcost-effectivesolutiontomanyembeddedcontrolapplications.TheAT89S52providesthefollowingtandardfeatures:11沈阳农业大学学士学位论文外文翻译8KbytesofFlash,256bytesofRAM,32I/Olines,Watchdogtimer,twodata
5、pointers,three16-bittimer/counters,asix-vectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcillator,andclockcircuitry.Inaddition,theAT89S52isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheC
6、PUwhileallowingtheRAM,timer/counters,serialport,andinterruptsystemtocontinuefunctioning.ThePower-downmodesavestheRAMcontentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenextinterruptorhardwarereset.PinConfigurationsBlockDiagram11沈阳农业大学学士学位论文外文翻译PinDescriptionVCCSu
7、pplyvoltage.GNDGround.Port0Port0isan8-bitopendrainbidirectionalI/Oport.Asanoutputport,eachpincansinkeightTTLinputs.When1sarewrittentoport0pins,thepinscanbeusedashigh-impedanceInputs.Port0canalsobeconfiguredtobethemultiplexedloworderaddress/databusduringccessestoexternalprogramandd
8、atamemory.Inthismode,P0hasint-ern
