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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT45F56 数据表(PDF) 24 Page - Holtek Semiconductor Inc |
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HT45F56 数据表(HTML) 24 Page - Holtek Semiconductor Inc |
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24 / 90 page  Rev. 1.11 24 April 11, 2017 Rev. 1.11 25 April 11, 2017 HT45F56 Shock Detector Flash MCU HT45F56 Shock Detector Flash MCU EEPROM Data Memory ThesedevicescontainanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileform ofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved.By incorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair. Capacity Address 32 x 8 00H ~ 1FH EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis32×8bitsforthedevice.UnliketheProgramMemory andRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspace andisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Readand WriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressanddata registerinBank0andasinglecontrolregisterinBank1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA andEEDregistersarelocatedinsector0,theycanbedirectlyaccessedinthesamewasasanyother SpecialFunctionRegister.TheEECregister,however,beinglocatedinsector1,canbereadfrom orwrittentoindirectlyusingtheMP1MemoryPointerandIndirectAddressingRegister,IAR1. BecausetheEECcontrolregisterislocatedataddress40HinBank1,theMemoryPointerlowbyte register,MP1,mustfirstbesettothevalue40HandtheBankPointerregister,BP,settothevalue, 01H,beforeanyoperationsontheEECregisterareexecuted. Register Name Bit 7 6 5 4 3 2 1 0 EEA — — — EEA4 EEA3 EEA2 EEA1 EEA0 EED D7 D6 D5 D4 D3 D2 D1 D0 EEC — — — — WREN WR RDEN RD EEPROM Registers List EEA Register Bit 7 6 5 4 3 2 1 0 Name — — — EEA4 EEA3 EEA2 EEA1 EEA0 R/W — — — R/W R/W R/W R/W R/W POR — — — 0 0 0 0 0 Bit7~5 Unimplemented,readas0. Bit4~0 EEA4~EEA0:DataEEPROMaddressbit4~bit0 |
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