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HT66F0187 Datasheet(PDF) 22 Page - Holtek Semiconductor Inc |
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HT66F0187 Datasheet(HTML) 22 Page - Holtek Semiconductor Inc |
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22 / 192 page  Rev. 1.20 22 ����st 2�� 201� Rev. 1.20 23 ����st 2�� 201� HT66F0187 A/D Flash MCU with EEPROM HT66F0187 A/D Flash MCU with EEPROM Forinstructionsinvolvingbranches,suchasjumporcallinstructions,twomachinecyclesare requiredtocompleteinstructionexecution.Anextracycleisrequiredastheprogramtakesone cycletofirstobtaintheactualjumporcalladdressandthenanothercycletoactuallyexecutethe branch.Therequirementforthisextracycleshouldbetakenintoaccountbyprogrammersintiming sensitiveapplications. Fe tc h In st . 1E xe cu te I ns t . 1 Fe tc h In st . 2 Fl us h Pi pel in e 1 2 3 4 5 6 DE LA Y: MO V A, [1 2H ] CA LL D EL AY CP L [ 12H ] : : NO P Ex ec ut e In st . 2 Fe tc h In st . 3 Fe tc h In st . 6 Ex ec ut e In s t. 6 Fe tc h In st . 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 PC11~PC8 PCL�~PCL0 Program Counter ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly intothisregister,ashortprogramjumpcanbeexecuteddirectly.However,asonlythislowbyte isavailableformanipulation,thejumpsarelimitedtothepresentpageofmemory,thatis256 locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycycle willbeinserted.ManipulatingthePCLregistermaycauseprogrambranching,soanextracycleis neededtopre-fetch. |
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