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HT45F4630 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc |
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HT45F4630 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 153 page  Rev. 1.00 3� ���i� 1�� �01� Rev. 1.00 33 ���i� 1�� �01� HT45F4630 DC Motor Driver ASSP MCU HT45F4630 DC Motor Driver ASSP 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 TheEEPROMDataMemorycapacityis512×8bitsforthedevice.UnliketheProgramMemoryand RAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspaceand isthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.ReadandWrite operationstotheEEPROMarecarriedoutinsinglebyteoperationsusingtwoaddressregistersand adataregisterinBank0andasinglecontrolregisterinBank1. EEPROM Registers FourregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregisters,EEA0andEEA1,thedataregister,EEDandasinglecontrolregister,EEC.As boththeEEA0,EEA1andEEDregistersarelocatedinBank0,theycanbedirectlyaccessedin thesamewasasanyotherSpecialFunctionRegister.TheEECregisterhowever,beinglocatedin Bank1,cannotbedirectlyaddresseddirectlyandcanonlybereadfromorwrittentoindirectlyusing theMP1MemoryPointerandIndirectAddressingRegister,IAR1.BecausetheEECcontrolregister islocatedataddress40HinBank1,theMP1MemoryPointermustfirstbesettothevalue40Hand theBankPointerregister,BP,settothevalue,01H,beforeanyoperationsontheEECregisterare executed. Register Name Bit 7 6 5 4 3 2 1 0 EE�0 D7 D� D5 D4 D3 D� D1 D0 EE�1 — — — — — — — D8 EED D7 D� D5 D4 D3 D� D1 D0 EEC — — — — WREN WR RDEN RD EEPROM Registers List EEA0 Register Bit 7 6 5 4 3 2 1 0 Name D7 D� D5 D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 0 0 0 0 0 0 0 0 Bit7~0 D7~D0:DataEEPROMaddress DataEEPROMaddressbit7~bit0 |
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