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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT66F25D датащи(PDF) 32 Page - Holtek Semiconductor Inc |
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HT66F25D датащи(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 177 page  Rev. 1.00 3� ���� ��� �01� Rev. 1.00 33 ���� ��� �01� A/D Flash Type 8-bit MCU with EEPROM HT66F24D/HT66F25D EEPROM Data Memory ThedevicecontainsanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileform ofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved.By incorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis64x8bitsforthisseriesofdevices.UnliketheProgram MemoryandRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemory spaceandisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Read andWriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressand dataregisterinBank0andasinglecontrolregisterinBank1. Device Capacity Address HT��F�4D �4 x 8 00H ~ 3FH HT��F�5D �4 x 8 00H ~ 3FH EEPROM Data Memory Structure EEPROM Registers ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA andEEDregistersarelocatedinBank0,theycanbedirectlyaccessedinthesamewasasanyother SpecialFunctionRegister.TheEECregisterhowever,beinglocatedinBank1,cannotbeaddressed directlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1MemoryPointerand IndirectAddressingRegister,IAR1.BecausetheEECcontrolregisterislocatedataddress40Hin Bank1,theMP1MemoryPointermustfirstbesettothevalue40HandtheBankPointerregister, BP,settothevalue,01H,beforeanyoperationsontheEECregisterareexecuted. HT66F24D/HT66F25D 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 - HT66F24D/HT66F25D Bit 7 6 5 4 3 2 1 0 Name — — 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,readas0 Bit5~0 DataEEPROMaddressbit5~bit0 |
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