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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT66F20 датащи(PDF) 29 Page - Holtek Semiconductor Inc |
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HT66F20 датащи(HTML) 29 Page - Holtek Semiconductor Inc |
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29 / 298 page  Rev. 1.90 �8 �e���a�� 18� �01� Rev. 1.90 �9 �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit 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,theProgramCounterisusedtokeeptrackoftheaddressofthenext instructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstructionis executedexceptforinstructions,suchas"JMP"or"CALL"thatdemandajumptoanon-consecutive ProgramMemoryaddress.Onlythelower8bits,knownastheProgramCounterLowRegister,are directlyaddressablebytheapplicationprogram. Whenexecutinginstructionsrequiringjumpstonon-consecutiveaddressessuchasajumpinstruction, asubroutinecall,interruptorreset,etc.,themicrocontrollermanagesprogramcontrolbyloading therequiredaddressintotheProgramCounter.Forconditionalskipinstructions,oncethecondition hasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresentinstruction execution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionisobtained. Device Program Counter Porgram Counter High Byte PCL Register HT66��0 PC9� PC8 PCL7~PCL0 HT66��0 PC10~PC8 HT66�40 PC11~PC8 HT66�50 PC1�~PC8 HT66�60 PC1�~PC8 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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