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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4MA 데이터시트(PDF) 31 Page - Holtek Semiconductor Inc |
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HT45F4MA 데이터시트(HTML) 31 Page - Holtek Semiconductor Inc |
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31 / 145 page  Rev. 1.20 30 De�e��e� 1�� 201� Rev. 1.20 31 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU EEPROM Data Memory OneofthespecialfeaturesinthedeviceisitsinternalEEPROMDataMemory.EEPROM,which standsforElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatile formofmemory,withdataretentionevenwhenitspowersupplyisremoved.Byincorporating thiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremadeavailabletothe designer.TheavailabilityofEEPROMstorageallowsinformationsuchasproductidentification numbers,calibrationvalues,specificuserdata,systemsetupdataorotherproductinformationto bestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingandwritingdatatothe EEPROMmemoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityisupto64×8bits.UnliketheProgramMemoryandRAM DataMemory,theEEPROMDataMemoryisnotdirectlymappedandisthereforenotdirectly accessibleinthesamewayastheothertypesofmemory.ReadandWriteoperationstothe EEPROMarecarriedoutinsinglebyteoperationsusinganaddressanddataregisterinBank0and asinglecontrolregisterinBank1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA andEEDregistersarelocatedinBank0,theycanbedirectlyaccessedinthesamewayasanyother SpecialFunctionRegister.TheEECregisterhowever,beinglocatedinBank1,cannotbedirectly addresseddirectlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1MemoryPointer andIndirectAddressingRegister,IAR1.BecausetheEECcontrolregisterislocatedataddress40H inBank1,theMP1MemoryPointermustfirstbesettothevalue40HandtheBankPointerregister, BP,settothevalue,01H,beforeanyoperationsontheEECregisterareexecuted. EEPROM Control Registers List Name Bit 7 6 5 4 3 2 1 0 EEA — — D5 D� D3 D2 D1 D0 EED D7 D� D5 D� D3 D2 D1 D0 EEC — — — — WREN WR RDEN RD EEA Register Bit 7 6 5 4 3 2 1 0 Na�e — — D5 D� D3 D2 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 DataEEPROMaddress DataEEPROMaddressbit5~bit0 |
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