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TheGeneralSituationofAT89C51
TheAT89C51isalow-power,high-performanceCMOS8-bit
microputerwith4KbytesofFlashProgrammableandErasableReadOnly
Memory(PEROM)and128bytesRAM.Thedeviceismanufacturedusing
Atmel’shighdensitynonvolatilememorytechnologyandispatiblewith
theindustrystandardMCS-51™instructionsetandpinout.Thechipbines
aversatile8-bitCPUwithFlashonamonolithicchip;theAtmelAT89C51
isapowerfulmicroputerwhichprovidesahighlyflexibleandcost
effectivesolutiontomanyembeddedcontrolapplications.
Features:
•patiblewithMCS-51™Products
•4KBytesofIn-SystemReprogrammableFlashMemory
•Endurance:1,000Write/EraseCycles
•FullyStaticOperation:0Hzto24MHz
•Three-LevelProgramMemoryLock
•128x8-BitInternalRAM
•32ProgrammableI/OLines
•Two16-BitTimer/Counters
•SixInterruptSources
•ProgrammableSerialChannel
•LowPowerIdleandPowerDownModes
TheAT89C51providesthefollowingstandardfeatures:4Kbytesof
Flash,128bytesofRAM,32I/Olines,two16-bittimer/counters,afive
vectortwo-levelinterruptarchitecture,afullduplexserialport,
on-chiposcillatorandclockcircuitry.Inaddition,theAT89C51isdesigned
withstaticlogicforoperationdowntozerofrequencyandsupportstwo
softwareselectablepowersavingmodes.TheIdleModestopstheCPU
whileallowingtheRAM,timer/counters,serialportandinterruptsystem
.v.
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tocontinuefunctioning.ThePower
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