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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F5N датащи(PDF) 39 Page - Holtek Semiconductor Inc |
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HT45F5N датащи(HTML) 39 Page - Holtek Semiconductor Inc |
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39 / 202 page  Rev. 1.00 3� �ove��e� 1�� �01� Rev. 1.00 39 �ove��e� 1�� �01� HT45F5N/HT45FH5N Power Bank ASSP Flash MCU HT45F5N/HT45FH5N Power Bank ASSP Flash MCU EEPROM Data Memory ThisdevicecontainsanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileform ofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved.By incorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis64×8bits.UnliketheProgramMemoryandRAMData Memory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspaceandisthereforenot directlyaddressableinthesamewayastheothertypesofmemory.ReadandWriteoperationstothe EEPROMarecarriedoutinsinglebyteoperationsusinganaddressandadataregisterinSector0,1 andasinglecontrolregisterinonlySector1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA andEEDregistersarelocatedinSector0,theycanbedirectlyaccessedinthesamewasasany otherSpecialFunctionRegister.TheEECregisterhowever,beinglocatedinonlySector1,cannot beaddresseddirectlyandonlycanbereadfromorwrittentoindirectlyusingtheMP1L/MP1Hor MP2L/MP2HMemoryPointerandIndirectAddressingRegister,IAR1/IAR2.BecausetheEEC controlregisterislocatedataddress40HinSector1,theMP1LorMP2LMemoryPointermustfirst besettothevalue40HandtheMP1HorMP2HMemoryPointerhighbytesettothevalue,01H, beforeanyoperationsontheEECregisterareexecuted. Register Name Bit 7 6 5 4 3 2 1 0 EEA — — D5 D4 D3 D� D1 D0 EED D7 D� D5 D4 D3 D� D1 D0 EEC — — — — WRE� WR RDE� RD EEPROM Register List EEA Register Bit 7 6 5 4 3 2 1 0 �a�e — — D5 D4 D3 D� D1 D0 R/W — — R/W R/W R/W R/W R/W R/W POR — — 0 0 0 0 0 0 Bit7~6 Unimplemented,readas"0" Bit5~0 D5~D0:DataEEPROMaddress DataEEPROMaddressbit5~bit0 |
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