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1、單片機微型計算機與接口技術AnOverviewofAT89S51TheAT89S51isalow-power,high-performanceCMOS8-bitmicrocontrollerwith4KbytesofIn-SystemProgrammableFlashmemory.ThedeviceismanufacturedusingAtmel'shigh-densitynonvolatilememorytechnologyandiscompatiblewiththeindustry-standard80C51instructi
2、onsetandpinout.Theon-chipFlashallowstheprogrammemorytobereprogrammedin-systemorbyaconventionalnonvolatilememoryprogrammer.Bycombiningaversatile8-bitCPUwithIn-SystemProgrammableFlashonamonolithicchip,theAtmelAT89S51isapowerfulmicrocontrollerwhichprovidesahighly-flexibl
3、eandcost-effectivesolutiontomanyembeddedcontrolapplications.Features：CompatiblewithMCS.-51Products4KBytesofIn-SystemProgrammable(ISP)FlashMemoryEndurance:1000Write/EraseCycles4.0Vto5.5VOperatingRangeFullyStaticOperation:0Hzto33MHzThree-levelProgramMemoryLock128x8-bitI
4、nternalRAM32ProgrammableI/OLinesTwo16-bitTimer/CountersSixInterruptSourcesFullDuplexUARTSerialChannelLow-powerIdleandPower-downModesInterruptRecoveryfromPower-downModeWatchdogTimerDualDataPointerPower-offFlagFastProgrammingTime13單片機微型計算機與接口技術FlexibleISPProgramming(Byt
5、eandPageMode)Green(Pb/Halide-free)PackagingOptionTheAT89S51providesthefollowingstandardfeatures:4KbytesofFlash,128bytesofRAM,32I/Olines,Watchdogtimer,twodatapointers,two16-bittimer/counters,afive-vectortwo-levelinterruptarchitecture,afullduplexserialport,on-chiposcill
6、ator,andclockcircuitry.Inaddition,theAT89S51isdesignedwithstaticlogicforoperationdowntozerofrequencyandsupportstwosoftwareselectablepowersavingmodes.TheIdleModestopstheCPUwhileallowingtheRAM,timer/counters,serialport,andinterruptsystemtocontinuefunctioning.ThePower-do
7、wnmodesavestheRAMcontentsbutfreezestheoscillator,disablingallotherchipfunctionsuntilthenextexternalinterruptorhardwarereset.VCC：Supplyvoltage(allpackagesexcept42-PDIP).GND：Ground(allpackagesexcept42-PDIP;for42-PDIPGNDconnectsonlythelogiccoreandtheembeddedprogrammemory
8、).VDD：Supplyvoltageforthe42-PDIPwhichconnectsonlythelogiccoreandtheembeddedprogrammemory.PWRVDD：Supplyvoltageforthe42-PDIPwh
