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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F488 датащи(PDF) 33 Page - Holtek Semiconductor Inc |
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HT67F488 датащи(HTML) 33 Page - Holtek Semiconductor Inc |
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33 / 171 page  Rev. 1.60 33 �ove��e� ��� �016 HT67F488/HT67F489 TinyPowerTM A/D Flash MCU with LCD & EEPROM EEPROM Data Memory TheHT67F489devicecontainsanareaofinternalEEPROMDataMemory.EEPROM,which standsforElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatile formofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved. Byincorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis64×8bitsforthedevice.UnliketheProgramMemory andRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspace andisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Readand WriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressanddata registerinSector0andasinglecontrolregisterinSector1. EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Theseare theaddressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.Asboththe EEAandEEDregistersarelocatedinSector0,theycanbedirectlyaccessedinthesamewasas anyotherSpecialFunctionRegister.TheEECregisterhowever,beinglocatedinSector1,cannot bedirectlyaddresseddirectlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1L/ MP1HMemoryPointerandIndirectAddressingRegister,IAR1.BecausetheEECcontrolregisteris locatedataddress40HinSector1,theMP1LMemoryPointerlowbytemustfirstbesettothevalue 40HandtheMP1HMemoryPointerhighbytesettothevalue01Hbeforeanyoperationsonthe EECregisterareexecuted. EEPROM Register List Name Bit 7 6 5 4 3 2 1 0 EEA — — D5 D4 D3 D� D1 D0 EED D7 D6 D5 D4 D3 D� D1 D0 EEC — — — — WRE� WR RDE� RD EEA Register Bit 7 6 5 4 3 2 1 0 �a�e — — D5 D4 D3 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 D5~D0:DataEEPROMaddress DataEEPROMaddressbit5~bit0 |
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