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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT82B42R датащи(PDF) 15 Page - Holtek Semiconductor Inc |
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HT82B42R датащи(HTML) 15 Page - Holtek Semiconductor Inc |
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15 / 84 page  Rev. 1.10 1� �ove��e� 0�� �01� Rev. 1.10 1� �ove��e� 0�� �01� HT82B42R/HT82B42RE I/O MCU with USB Interface Stack ThisisaspecialpartofthememorywhichisusedtosavethecontentsoftheProgramCounter only.Thestackhas8levelsandisneitherpartofthedatanorpartoftheprogramspace,andis neitherreadablenorwriteable.TheactivatedlevelisindexedbytheStackPointer,SP,andis neitherreadablenorwriteable.Atasubroutinecallorinterruptacknowledgesignal,thecontentsof theProgramCounterarepushedontothestack.Attheendofasubroutineoraninterruptroutine, signaledbyareturninstruction,RETorRETI,theProgramCounterisrestoredtoitspreviousvalue fromthestack.Afteradevicereset,theStackPointerwillpointtothetopofthestack. Ifthestackisfullandanenabledinterrupttakesplace,theinterruptrequestflagwillberecordedbut theacknowledgesignalwillbeinhibited.WhentheStackPointerisdecremented,byRETorRETI, theinterruptwillbeserviced.Thisfeaturepreventsstackoverflowallowingtheprogrammertouse thestructuremoreeasily.However,whenthestackisfull,aCALLsubroutineinstructioncanstill beexecutedwhichwillresultinastackoverflow.Precautionsshouldbetakentoavoidsuchcases whichmightcauseunpredictableprogrambranching. Pr og ra m Co un te r St ac k Le ve l 1 St ac k Le ve l 2 St ac k Le ve l 3 St ac k Le ve l 8 Pr og ra m Me mo ry T op of S ta ck St ac k Po in te r Bo tt om o f St ac k Arithmetic and Logic Unit – ALU Thearithmetic-logicunitorALUisacriticalareaofthemicrocontrollerthatcarriesoutarithmetic andlogicoperationsoftheinstructionset.Connectedtothemainmicrocontrollerdatabus,theALU receivesrelatedinstructioncodesandperformstherequiredarithmeticorlogicaloperationsafter whichtheresultwillbeplacedinthespecifiedregister.AstheseALUcalculationoroperationsmay resultincarry,borroworotherstatuschanges,thestatusregisterwillbecorrespondinglyupdatedto reflectthesechanges.TheALUsupportsthefollowingfunctions: • Arithmeticoperations:ADD,ADDM,ADC,ADCM,SUB,SUBM,SBC,SBCM,DAA • Logicoperations:AND,OR,XOR,ANDM,ORM,XORM,CPL,CPLA • Rotation:RRA,RR,RRCA,RRC,RLA,RL,RLCA,RLC • IncrementandDecrement:INCA,INC,DECA,DEC • Branchdecision:JMP,SZ,SZA,SNZ,SIZ,SDZ,SIZA,SDZA,CALL,RET,RETI |
Аналогичный номер детали - HT82B42R_14 |
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Аналогичное описание - HT82B42R_14 |
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