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HT46R002 데이터시트(PDF) 12 Page - Holtek Semiconductor Inc

부품명 HT46R002
상세설명  Cost-Effective A/D 8-Bit OTP MCU
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제조업체  HOLTEK [Holtek Semiconductor Inc]
홈페이지  http://www.holtek.com
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HT46R002 데이터시트(HTML) 12 Page - Holtek Semiconductor Inc

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Rev. 1.21
12
April 11, 2017
Rev. 1.21
13
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
Program Counter – PC
Duringprogramexecution,theProgramCounterisusedtokeeptrackoftheaddressofthe
nextinstructiontobeexecuted.Itisautomaticallyincrementedbyoneeachtimeaninstruction
isexecutedexceptforinstructions,suchas“JMP”or“CALL”thatdemandajumptoanon-
consecutiveProgramMemoryaddress.Itmustbenotedthatonlythelower8bits,knownasthe
ProgramCounterLowRegister,aredirectlyaddressablebyuser.
Whenexecutinginstructionsrequiringjumpingtonon-consecutiveaddressessuchasajump
instruction,asubroutinecall,interruptorreset,etc,themicrocontrollermanagesprogramcontrol
byloadingtherequiredaddressintotheProgramCounter.Forconditionalskipinstructions,once
theconditionhasbeenmet,thenextinstruction,whichhasalreadybeenfetchedduringthepresent
instructionexecution,isdiscardedandadummycycletakesitsplacewhilethecorrectinstructionis
obtained.
Program Counter
High Byte of Program
Low Byte of Program
PC9, PC8
PCL7~PCL0
ThelowerbyteoftheProgramCounter,knownastheProgramCounterLowregisterorPCL,is
availableforprogramcontrolandisareadableandwriteableregister.Bytransferringdatadirectly
intothisregister,ashortprogramjumpcanbeexecuteddirectly.However,asonlythislowbyte
isavailableformanipulation,thejumpsarelimitedinthepresentpageofmemory,whichhave
256locations.Whensuchprogramjumpsareexecuteditshouldalsobenotedthatadummycycle
willbeinserted.ThelowerbyteoftheProgramCounterisfullyaccessibleunderprogramcontrol.
ManipulatingthePCLmightcauseprogrambranching,soanextracycleisneededtopre-fetch.
Stack
ThisisaspecialpartofthememorywhichisusedtosavethecontentsoftheProgramCounter
only.Thestackisorganizedinto2levelsandneitherpartofthedatanorpartoftheprogramspace,
andisneitherreadablenorwriteable.TheactivatedlevelisindexedbytheStackPointer,andis
neitherreadablenorwriteable.Atasubroutinecallorinterruptacknowledgesignal,thecontentsof
theProgramCounterarepushedontothestack.Attheendofasubroutineoraninterruptroutine,
signaledbyareturninstruction,RETorRETI,theProgramCounterisrestoredtoitspreviousvalue
fromthestack.Afteradevicereset,theStackPointerwillpointtothetopofthestack.
Pr ogr am C ount er
St a ck Lev el 1
St a ck Lev el 2
Pr ogr am
Me mo ry
To p of S ta ck
St ac k
Po in te r
Bo tto m of S ta ck
Ifthestackisfullandanenabledinterrupttakesplace,theinterruptrequestflagwillberecordedbut
theacknowledgesignalwillbeinhibited.WhentheStackPointerisdecremented,byRETorRETI,
theinterruptwillbeserviced.Thisfeaturepreventsstackoverflowallowingtheprogrammertouse
thestructuremoreeasily.However,whenthestackisfull,aCALLsubroutineinstructioncanstill
beexecutedwhichwillresultinastackoverflow.Precautionsshouldbetakentoavoidsuchcases
whichmightcauseunpredictableprogrambranching.


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