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HT66F002 Datasheet(PDF) 32 Page - Holtek Semiconductor Inc |
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HT66F002 Datasheet(HTML) 32 Page - Holtek Semiconductor Inc |
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32 / 144 page  Rev. 1.71 32 April 11, 2017 Rev. 1.71 33 April 11, 2017 HT66F002/HT66F0025/HT66F003/HT66F004 Cost-Effective A/D Flash MCU with EEPROM HT66F002/HT66F0025/HT66F003/HT66F004 Cost-Effective A/D Flash MCU with EEPROM STATUS Register Bit 7 6 5 4 3 2 1 0 Name — — TO PDF OV Z AC C R/W — — R R R/W R/W R/W R/W POR — — 0 0 × × × × "×" unknown Bit7~6 Unimplemented,readas"0" Bit5 TO:WatchdogTime-Outflag 0:Afterpoweruporexecutingthe"CLRWDT"or"HALT"instruction 1:Awatchdogtime-outoccurred. Bit4 PDF:Powerdownflag 0:Afterpoweruporexecutingthe"CLRWDT"instruction 1:Byexecutingthe"HALT"instruction Bit3 OV:Overflowflag 0:nooverflow 1:anoperationresultsinacarryintothehighest-orderbitbutnotacarryoutofthehighest- orderbitorviceversa. Bit2 Z:Zeroflag 0:Theresultofanarithmeticorlogicaloperationisnotzero 1:Theresultofanarithmeticorlogicaloperationiszero Bit1 AC:Auxiliaryflag 0:noauxiliarycarry 1:anoperationresultsinacarryoutofthelownibblesinaddition,ornoborrowfromthehigh nibbleintothelownibbleinsubtraction Bit0 C:Carryflag 0:nocarry-out 1:anoperationresultsinacarryduringanadditionoperationorifaborrowdoesnottakeplace duringasubtractionoperation Cisalsoaffectedbyarotatethroughcarryinstruction. EEPROM Data Memory ThesedevicescontainanareaofinternalEEPROMDataMemory.EEPROM,whichstandsfor ElectricallyErasableProgrammableReadOnlyMemory,isbyitsnatureanon-volatileformof memory,withdataretentionevenwhenitspowersupplyisremoved.Byincorporatingthiskind ofdatamemory,awholenewhostofapplicationpossibilitiesaremadeavailabletothedesigner. TheavailabilityofEEPROMstorageallowsinformationsuchasproductidentificationnumbers, calibrationvalues,specificuserdata,systemsetupdataorotherproductinformationtobestored directlywithintheproductmicrocontroller.TheprocessofreadingandwritingdatatotheEEPROM memoryhasbeenreducedtoaverytrivialaffair. EEPROM Data Memory Structure TheEEPROMDataMemorycapacityis32×8bitsforthisseriesofdevices.UnliketheProgram MemoryandRAMDataMemory,theEEPROMDataMemoryisnotdirectlymappedandis thereforenotdirectlyaccessibleinthesamewayastheothertypesofmemory.ReadandWrite operationstotheEEPROMarecarriedoutinsinglebyteoperationsusingtwoaddressregistersand onedataregisterinBank0andasinglecontrolregisterinBank1. |
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