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HT45F3W Datasheet(PDF) 41 Page - Holtek Semiconductor Inc |
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HT45F3W Datasheet(HTML) 41 Page - Holtek Semiconductor Inc |
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41 / 167 page  Rev. 1.50 40 De�e��e� 01� �01� Rev. 1.50 41 De�e��e� 01� �01� HT45F3W R-Type Blood Pressure Meter Flash MCU HT45F3W R-Type Blood Pressure Meter 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 TheEEPROMDataMemorycapacityis64x8bitsforthedevice.UnliketheProgramMemory andRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspace andisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Readand WriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressanddata registerinBank0andasinglecontrolregisterinBank1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEAand EEDregistersarelocatedinBank0,theycanbedirectlyaccessedinthesamewasasanyotherSpecial FunctionRegister.TheEECregisterhowever,beinglocatedinBank1,cannotbedirectlyaddressed directlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1MemoryPointerandIndirect AddressingRegister,IAR1.BecausetheEECcontrolregisterislocatedataddress40HinBank1,the MP1MemoryPointermustfirstbesettothevalue40HandtheBankPointerregister,BP,settothe value,01H,beforeanyoperationsontheEECregisterareexecuted. EEPROM Register List 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 — — — — WREN WR RDEN RD EEA Register Bit 7 6 5 4 3 2 1 0 Na�e — — D5 D4 D3 D� D1 D0 R/W — — R/W R/W R/W R/W R/W R/W POR — — x x x x x x “x” unknown Bit7~6 Unimplemented,readas“0” Bit5~0 D5~D0:DataEEPROMaddress DataEEPROMaddressbit5~bit0 |
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