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HT45R4U датащи(PDF) 25 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 25 Page - Holtek Semiconductor Inc |
25 / 105 page Rev. 1.10 �4 �a��� 1�� �01� Rev. 1.10 �� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD Bank Pointer − BP TheDataMemoryisdividedseveralbanks,thetotalnumberofwhichdependsuponthedevice chosen.SelectingtherequiredDataMemoryareaisachievedusingtheBankPointer.IfdatainBank 0istobeaccessed,thentheBPregistermustbeloadedwiththevalue00H,whileifdatainBank1 istobeaccessed,thentheBPregistermustbeloadedwiththevalue01H,andsoon. TheDataMemoryisinitialisedtoBank0afterareset,exceptfortheWDTtime-outresetinthe PowerDownMode,inwhichcase,theDataMemorybankremainsunaffected.Itshouldbenoted thattheSpecialFunctionDataMemoryisnotaffectedbythebankselection,whichmeansthatthe SpecialFunctionRegisterscanbeaccessedfromwithinanybank.DirectlyaddressingtheData MemorywillalwaysresultinBank0beingaccessedirrespectiveofthevalueoftheBankPointer. AccessingdatafrombanksotherthanBank0mustbeimplementedusingIndirectaddressing. BP Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 BP� D4 D3 BP� BP1 BP0 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 Bit7~6 D7~D6:undefinedbits Thesebitscanbereadorwrittenbyusersoftwareprogram Bit5 BP5:Programmemorybankpoint 0:ProgrammemoryBank0 1:ProgrammemoryBank1 TheprogramMemoryhasthecapacityof16Kwordsimplementedas8Kwordsx2Banks. Bit4~3 D4~D3:undefinedbits Thesebitscanbereadorwrittenbyusersoftwareprogram Bit2~0 BP2~PB0:Datamemorybankpoint 000:GeneralPurposeDataMemoryBank0 001:Bank1,LCDdisplaymemory 010:GeneralPurposeDataMemoryBank2 011:GeneralPurposeDataMemoryBank3 100:GeneralPurposeDataMemoryBank4 101:GeneralPurposeDataMemoryBank5 110:GeneralPurposeDataMemoryBank6 111: Unomplemented Accumulator − ACC TheAccumulatoriscentraltotheoperationofanymicrocontrollerandiscloselyrelatedwith operationscarriedoutbytheALU.TheAccumulatoristheplacewhereallintermediateresults fromtheALUarestored.WithouttheAccumulatoritwouldbenecessarytowritetheresultof eachcalculationorlogicaloperationsuchasaddition,subtraction,shift,etc.,totheDataMemory resultinginhigherprogrammingandtimingoverheads.Datatransferoperationsusuallyinvolve thetemporarystoragefunctionoftheAccumulator;forexample,whentransferringdatabetween oneuserdefinedregisterandanother,itisnecessarytodothisbypassingthedatathroughthe Accumulatorasnodirecttransferbetweentworegistersispermitted. |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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