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Rev. 2.50 44 June 22, 2017 Rev. 2.50 45 June 22, 2017

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

A/D Flash MCU with EEPROM

EEPROM Data Memory

ThedevicecontainsanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor

ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileform

ofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved.By

incorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade

availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct

identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct

informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand

writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair.

EEPROM Data Memory Structure

TheEEPROMDataMemorycapacityvariesfrom32×8to256×8bits,accordingtothedevice

selected.UnliketheProgramMemoryandRAMDataMemory,theEEPROMDataMemoryisnot

directlymappedintomemoryspaceandisthereforenotdirectlyaddressableinthesamewayasthe

othertypesofmemory.ReadandWriteoperationstotheEEPROMarecarriedoutinsinglebyte

operationsusinganaddressanddataregisterinBank0andasinglecontrolregisterinBank1.

Device Capacity Address

HT66F20 32×8

00H~1FH

HT66F30 64×8 00H~3FH

HT66F40

128×8 00H~7FH

HT66F50/HT66F60 256×8 00H~FFH

EEPROM Registers

ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe

addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA

andEEDregistersarelocatedinBank0,theycanbedirectlyaccessedinthesamewasasanyother

SpecialFunctionRegister.TheEECregisterhowever,beinglocatedinBank1,cannotbedirectly

addresseddirectlyandcanonlybereadfromorwrittentoindirectlyusingtheMP1MemoryPointer

andIndirectAddressingRegister,IAR1.BecausetheEECcontrolregisterislocatedataddress40H

inBank1,theMP1MemoryPointermustrstbesettothevalue40HandtheBankPointerregister,

BP,settothevalue,01H,beforeanyoperationsontheEECregisterareexecuted.

Holtek HT66F30 User Manual

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