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HT46R068B Datasheet(PDF) 18 Page - Holtek Semiconductor Inc |
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HT46R068B Datasheet(HTML) 18 Page - Holtek Semiconductor Inc |
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18 / 135 page  Rev. 1.50 18 �e���a�� 05� �015 Rev. 1.50 19 �e���a�� 05� �015 HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU HT46R068B/HT46R069B Enhanced A/D 8-Bit OTP MCU Stack ThisisaspecialpartofthememorywhichisusedtosavethecontentsoftheProgramCounter only.ThestackisneitherpartoftheDataorProgramMemoryspace,andisneitherreadablenor writeable.TheactivatedlevelisindexedbytheStackPointer,SP,andisneitherreadablenor writeable.Atasubroutinecallorinterruptacknowledgesignal,thecontentsoftheProgramCounter arepushedontothestack.Attheendofasubroutineoraninterruptroutine,signaledbyareturn instruction,RETorRETI,theProgramCounterisrestoredtoitspreviousvaluefromthestack.After adevicereset,theStackPointerwillpointtothetopofthestack. Pr ogr am C ount er St a ck Lev el 1 St a ck Lev el 2 St a ck Lev el 3 St a ck Lev el 8 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 Device Stack Levels HT46R068B HT46R069B 8 Ifthestackisfullandanenabledinterrupttakesplace,theinterruptrequestflagwillberecordedbut theacknowledgesignalwillbeinhibited.WhentheStackPointerisdecremented,byRETorRETI, theinterruptwillbeserviced.Thisfeaturepreventsstackoverflowallowingtheprogrammertouse thestructuremoreeasily.However,whenthestackisfull,aCALLsubroutineinstructioncanstill beexecutedwhichwillresultinastackoverflow.Precautionsshouldbetakentoavoidsuchcases whichmightcauseunpredictableprogrambranching. 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 • RotationRRA,RR,RRCA,RRC,RLA,RL,RLCA,RLC • IncrementandDecrementINCA,INC,DECA,DEC • Branchdecision,JMP,SZ,SZA,SNZ,SIZ,SDZ,SIZA,SDZA,CALL,RET,RETI |
Número de pieza similar - HT46R068B_15 |
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Descripción similar - HT46R068B_15 |
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