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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT68F005 데이터시트(PDF) 25 Page - Holtek Semiconductor Inc |
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HT68F005 데이터시트(HTML) 25 Page - Holtek Semiconductor Inc |
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25 / 93 page  Rev. 1.00 �4 ��to�e� ��� �01� Rev. 1.00 �5 ��to�e� ��� �01� HT68F005/HT68F006 Enhanced I/O Flash Type MCU HT68F005/HT68F006 Enhanced I/O Flash Type 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. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis32×8bitsforthisseriesofdevices.UnliketheProgram MemoryandRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemory spaceandisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Read andWriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressand dataregisterinBank0andasinglecontrolregisterinBank1. Device Capacity Address All devi�es 3�×8 00H~1FH EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA andEEDregistersarelocatedinBank0,theycanbedirectlyaccessedinthesamewasasanyother SpecialFunctionRegister.TheEECregisterhowever,beinglocatedinBank1,cannotbeaddressed directlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1MemoryPointerand IndirectAddressingRegister,IAR1.BecausetheEECcontrolregisterislocatedataddress40Hin Bank1,theMP1MemoryPointermustfirstbesettothevalue40HandtheBankPointerregister, BP,settothevalue,01H,beforeanyoperationsontheEECregisterareexecuted. EEPROM Register List Name Bit 7 6 5 4 3 2 1 0 EEA — — — D4 D3 D� D1 D0 EED D7 D6 D5 D4 D3 D� D1 D0 EEC — — — — WREN WR RDEN RD EEA Register Bit 7 6 5 4 3 2 1 0 Name — — — D4 D3 D� D1 D0 R/W — — — R/W R/W R/W R/W R/W P�R — — — x x x x x “x” unknown Bit7~5 Unimplemented,readas“0” Bit4~0 DataEEPROMaddress DataEEPROMaddressbit4~bit0 |
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