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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F0060 데이터시트(PDF) 13 Page - Holtek Semiconductor Inc |
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HT45F0060 데이터시트(HTML) 13 Page - Holtek Semiconductor Inc |
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13 / 95 page  Rev. 1.00 12 July 19, 2017 Rev. 1.00 13 July 19, 2017 HT45F0060 RGB Dimming LED Flash MCU HT45F0060 RGB Dimming LED Flash MCU Execute Inst. 1 Fetch Inst. 2 1 MOV A, [12H] 2 CALL DELAY 3 CPL [12H] 4: 5: 6 DELAY: NOP Fetch Inst. 1 Execute Inst. 2 Fetch Inst. 3 Flush Pipeline Fetch Inst. 6 Execute Inst. 6 Fetch Inst. 7 Instruction Fetching Program Counter Duringprogramexecution,theProgramCounterisusedtokeeptrackoftheaddressofthe nextinstructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstruction isexecutedexceptforinstructions,suchas"JMP"or"CALL"thatdemandsajumptoanon- consecutiveProgramMemoryaddress.Onlythelower8bits,knownastheProgramCounterLow Register,aredirectlyaddressablebytheapplicationprogram. Whenexecutinginstructionsrequiringjumpstonon-consecutiveaddressessuchasajump instruction,asubroutinecall,interruptorreset,etc.,themicrocontrollermanagesprogramcontrol byloadingtherequiredaddressintotheProgramCounter.Forconditionalskipinstructions,once theconditionhasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresent instructionexecution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionis obtained. Program Counter Program Counter High Byte PCL Register PC9~PC8 PCL7~PCL0 Program Counter ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly intothisregister,ashortprogramjumpcanbeexecuteddirectly.However,asonlythislowbyte isavailableformanipulation,thejumpsarelimitedtothepresentpageofmemorythatis256 locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycycle willbeinserted.ManipulatingthePCLregistermaycauseprogrambranching,soanextracycleis neededtopre-fetch. |
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