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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT67F4892 датащи(PDF) 21 Page - Holtek Semiconductor Inc |
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HT67F4892 датащи(HTML) 21 Page - Holtek Semiconductor Inc |
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21 / 188 page  Rev. 1.00 �0 �ove��e� ��� �01� Rev. 1.00 �1 �ove��e� ��� �01� HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM HT67F4892 Enhanced A/D Flash MCU with LCD & EEPROM Fetch Inst. 1 1 MOV A�[1�H] � CALL DELAY 3 CPL [1�H] � : 5 : � DELAY: �OP Execute Inst. 1 Fetch Inst. � Execute Inst. � Fetch Inst. 3 Flush Pipeline Fetch Inst. � Execute Inst. � 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 PC1�~PC8 PCL7~PCL0 Program Counter ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly intothisregister,ashortprogramjumpcanbeexecuteddirectly.However,asonlythislowbyte isavailableformanipulation,thejumpsarelimitedtothepresentpageofmemory,thatis256 locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycycle willbeinserted.ManipulatingthePCLregistermaycauseprogrambranching,soanextracycleis neededtopre-fetch. Stack ThisisaspecialpartofthememorywhichisusedtosavethecontentsoftheProgramCounteronly. Thestackisorganizedinto8levelsandisneitherpartofthedatanorpartoftheprogramspace, andisneitherreadablenorwriteable.TheactivatedlevelisindexedbytheStackPointer,andis neitherreadablenorwriteable.Atasubroutinecallorinterruptacknowledgesignal,thecontentsof theProgramCounterarepushedontothestack.Attheendofasubroutineoraninterruptroutine, signaledbyareturninstruction,RETorRETI,theProgramCounterisrestoredtoitspreviousvalue fromthestack.Afteradevicereset,theStackPointerwillpointtothetopofthestack. |
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