HT66F005 datasheet(27/109 Pages) HOLTEK

27 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

EEPROM Data Memory

ThesedevicescontainanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor

ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileform

ofre-programmablememory,withdataretentionevenwhenitspowersupplyisremoved.By

incorporatingthiskindofdatamemory,awholenewhostofapplicationpossibilitiesaremade

availabletothedesigner.TheavailabilityofEEPROMstorageallowsinformationsuchasproduct

identificationnumbers,calibrationvalues,specificuserdata,systemsetupdataorotherproduct

informationtobestoreddirectlywithintheproductmicrocontroller.Theprocessofreadingand

writingdatatotheEEPROMmemoryhasbeenreducedtoaverytrivialaffair.

EEPROM Data Memory Structure

TheEEPROMDataMemorycapacityis32×8bitsforthisseriesofdevices.UnliketheProgram

MemoryandRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedintomemory

spaceandisthereforenotdirectlyaddressableinthesamewayastheothertypesofmemory.Read

andWriteoperationstotheEEPROMarecarriedoutinsinglebyteoperationsusinganaddressand

dataregisterinBank0andasinglecontrolregisterinBank1.

Device

Capacity

Address

�� devices

3�×8

00H~1FH

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.

EEPROM Register List

Name

Bit

EE�

—

D�

EED

D�

EEC

—

WREN

RDEN

EEA Register

Bit

Name

—

D�

R/W

—

R/W

POR

—

“x” unknown

Bit7~5

Unimplemented,readas“0”

Bit4~0

DataEEPROMaddress

DataEEPROMaddressbit4~bit0

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