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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT45F5Q датащи(PDF) 29 Page - Holtek Semiconductor Inc |
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HT45F5Q датащи(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 114 page  Rev. 1.10 �8 De�e��e� 1�� �01� Rev. 1.10 �9 De�e��e� 1�� �01� HT45F5Q Charger Flash MCU HT45F5Q Charger Flash MCU EEPROM Data Memory ThisdevicecontainsanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileformof memory,withdataretentionevenwhenitspowersupplyisremoved.Byincorporatingthiskind ofdatamemory,awholenewhostofapplicationpossibilitiesaremadeavailabletothedesigner. TheavailabilityofEEPROMstorageallowsinformationsuchasproductidentificationnumbers, calibrationvalues,specificuserdata,systemsetupdataorotherproductinformationtobestored directlywithintheproductmicrocontroller.TheprocessofreadingandwritingdatatotheEEPROM memoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis32×8bitsforthisdevice.UnliketheProgramMemory andRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedandisthereforenot directlyaccessibleinthesamewayastheothertypesofmemory.ReadandWriteoperationstothe EEPROMarecarriedoutinsinglebyteoperationsusingoneaddressregisterandonedataregisterin Bank0andasinglecontrolregisterinBank1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregisters,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 — — — D4 D� D� D1 D0 EED D7 D� D5 D4 D� D� D1 D0 EEC — — — — WREN WR RDEN RD EEA Register Bit 7 6 5 4 3 2 1 0 Na�e — — — D4 D� D� D1 D0 R/W — — — R/W R/W R/W R/W R/W POR — — — 0 0 0 0 0 Bit7~5 Unimplemented,readas“0” Bit4~0 D4~D0:DataEEPROMaddress DataEEPROMaddressbit4~bit0 |
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