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HT66FV240 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

Part # HT66FV240
Description  Wireless Voice Flash MCU
PDF  203 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT66FV240 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc

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Rev. 1.40
38
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Rev. 1.40
39
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HT66FV240
Wireless Voice Flash MCU
HT66FV240
Wireless Voice Flash MCU
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
TheEEPROMDataMemorycapacityis128×8bits.UnliketheProgramMemoryandRAMData
Memory,theEEPROMDataMemoryisnotdirectlymappedintomemoryspaceandisthereforenot
directlyaddressableinthesamewayastheothertypesofmemory.ReadandWriteoperationstothe
EEPROMarecarriedoutinsinglebyteoperationsusinganaddressanddataregisterinsector0and
asinglecontrolregisterinsector1.
EEPROM Registers
ThreeregisterscontroltheoveralloperationoftheinternalEEPROMDataMemory.Thesearethe
addressregister,EEA,thedataregister,EEDandasinglecontrolregister,EEC.AsboththeEEA
andEEDregistersarelocatedinsector0,theycanbedirectlyaccessedinthesamewasasanyother
SpecialFunctionRegister.TheEECregister,however,beinglocatedinsector1,canbereadfrom
orwrittentoindirectlyusingtheMP1H/MP1LorMP2H/MP2LMemoryPointerpairandIndirect
AddressingRegister,IAR1orIAR2.BecausetheEECcontrolregisterislocatedataddress40H
insector1,theMemoryPointerlowbyteregister,MP1LorMP2L,mustfirstbesettothevalue
40HandtheMemoryPointerhighbyteregister,MP1HorMP2H,settothevalue,01H,beforeany
operationsontheEECregisterareexecuted.
Register
Name
Bit
7
6
5
4
3
2
1
0
EEA
—
EEA�
EEA�
EEA4
EEA3
EEA�
EEA1
EEA0
EED
D7
D�
D�
D4
D3
D�
D1
D0
EEC
—
—
—
—
WREN
WR
RDEN
RD
EEPROM Registers List
EEA Register
Bit
7
6
5
4
3
2
1
0
Na�e
—
EEA�
EEA�
EEA4
EEA3
EEA�
EEA1
EEA0
R/W
—
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
0
0
0
0
0
0
0
Bit7
Unimplemented,readas0.
Bit6~0
EEA6~EEA0:DataEEPROMaddressbit6~bit0
EED Register
Bit
7
6
5
4
3
2
1
0
Na�e
D7
D�
D�
D4
D3
D�
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
POR
0
0
0
0
0
0
0
0
Bit7~0
D7~D0:DataEEPROMdatabit7~bit0



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