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HT45F4M Datasheet(PDF) 27 Page - Holtek Semiconductor Inc |
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HT45F4M Datasheet(HTML) 27 Page - Holtek Semiconductor Inc |
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27 / 138 page  Rev. 1.10 �6 �an�a�� 1�� �01� Rev. 1.10 �7 �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP 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 — — D� D4 D� D� D1 D0 EED D7 D6 D� D4 D� D� D1 D0 EEC — — — — WREN WR RDEN RD EEA Register Bit 7 6 5 4 3 2 1 0 Name — — D� D4 D� 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 DataEEPROMaddress DataEEPROMaddressbit5~bit0 |
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