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データシートサーチシステム |
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データシートサーチシステム |
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HT45F56 データシート(PDF) 13 Page - Holtek Semiconductor Inc |
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HT45F56 データシート(HTML) 13 Page - Holtek Semiconductor Inc |
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13 / 90 page  Rev. 1.11 12 April 11, 2017 Rev. 1.11 13 April 11, 2017 HT45F56 Shock Detector Flash MCU HT45F56 Shock Detector Flash MCU Fetch Inst. 1 1 MOV A,[12H] 2 CALL DELAY 3 CPL [12H] 4 : 5 : 6 DELAY: NOP Execute Inst. 1 Fetch Inst. 2 Execute Inst. 2 Fetch Inst. 3 Flush Pipeline Fetch Inst. 6 Execute Inst. 6 Fetch Inst. 7 Instruction Featching Program Counter Duringprogramexecution,theProgramCounterisusedtokeeptrackoftheaddressofthe nextinstructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstruction isexecutedexceptforinstructions,suchas“JMP”or“CALL”thatdemandajumptoanon- consecutiveProgramMemoryaddress.Onlythelower8bits,knownastheProgramCounterLow Register,aredirectlyaddressablebytheapplicationprogram. Whenexecutinginstructionsrequiringjumpstonon-consecutiveaddressessuchasajump instruction,asubroutinecall,interruptorreset,etc.,themicrocontrollermanagesprogramcontrol byloadingtherequiredaddressintotheProgramCounter.Forconditionalskipinstructions,once theconditionhasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresent instructionexecution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionis obtained. Program Counter High Byte Low Byte (PCL) PC9~PC8 PC7~PC0 Program Counter ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly intothisregister,ashortprogramjumpcanbeexecuteddirectly;however,asonlythislowbyte isavailableformanipulation,thejumpsarelimitedtothepresentpageofmemorythatis256 locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycycle willbeinserted.ManipulatingthePCLregistermaycauseprogrambranching,soanextracycleis neededtopre-fetch. |
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