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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4MA 데이터시트(PDF) 130 Page - Holtek Semiconductor Inc |
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HT45F4MA 데이터시트(HTML) 130 Page - Holtek Semiconductor Inc |
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130 / 145 page  Rev. 1.20 130 De�e��e� 1�� 201� Rev. 1.20 131 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU Logical and Rotate Operations ThestandardlogicaloperationssuchasAND,OR,XORandCPLallhavetheirowninstruction withintheHoltekmicrocontrollerinstructionset.Aswiththecaseofmostinstructionsinvolving datamanipulation,datamustpassthroughtheAccumulatorwhichmayinvolveadditional programmingsteps.Inalllogicaldataoperations,thezeroflagmaybesetiftheresultofthe operationiszero.Anotherformoflogicaldatamanipulationcomesfromtherotateinstructionssuch asRR,RL,RRCandRLCwhichprovideasimplemeansofrotatingonebitrightorleft.Different rotateinstructionsexistdependingonprogramrequirements.Rotateinstructionsareusefulforserial portprogrammingapplicationswheredatacanberotatedfromaninternalregisterintotheCarry bitfromwhereitcanbeexaminedandthenecessaryserialbitsethighorlow.Anotherapplication whererotatedataoperationsareusedistoimplementmultiplicationanddivisioncalculations. Branches and Control Transfer ProgrambranchingtakestheformofeitherjumpstospecifiedlocationsusingtheJMPinstructionor toasubroutineusingtheCALLinstruction.Theydifferinthesensethatinthecaseofasubroutine call,theprogrammustreturntotheinstructionimmediatelywhenthesubroutinehasbeencarried out.ThisisdonebyplacingareturninstructionRETinthesubroutinewhichwillcausetheprogram tojumpbacktotheaddressrightaftertheCALLinstruction.InthecaseofaJMPinstruction,the programsimplyjumpstothedesiredlocation.Thereisnorequirementtojumpbacktotheoriginal jumpingoffpointasinthecaseoftheCALLinstruction.Onespecialandextremelyusefulset ofbranchinstructionsaretheconditionalbranches.Hereadecisionisfirstmaderegardingthe conditionofacertaindatamemoryorindividualbits.Dependingupontheconditions,theprogram willcontinuewiththenextinstructionorskipoveritandjumptothefollowinginstruction.These instructionsarethekeytodecisionmakingandbranchingwithintheprogramperhapsdetermined bytheconditionofcertaininputswitchesorbytheconditionofinternaldatabits. Bit Operations TheabilitytoprovidesinglebitoperationsonDataMemoryisanextremelyflexiblefeatureofall Holtekmicrocontrollers.Thisfeatureisespeciallyusefulforoutputportbitprogrammingwhere individualbitsorportpinscanbedirectlysethighorlowusingeitherthe″SET[m].i″or″CLR[m].i″ instructionsrespectively.Thefeatureremovestheneedforprogrammerstofirstreadthe8-bitoutput port,manipulatetheinputdatatoensurethatotherbitsarenotchangedandthenoutputtheportwith thecorrectnewdata.Thisread-modify-writeprocessistakencareofautomaticallywhenthesebit operationinstructionsareused. Table Read Operations Datastorageisnormallyimplementedbyusingregisters.However,whenworkingwithlarge amountsoffixeddata,thevolumeinvolvedoftenmakesitinconvenienttostorethefixeddatain theDataMemory.Toovercomethisproblem,HoltekmicrocontrollersallowanareaofProgram Memorytobesetupasatablewheredatacanbedirectlystored.Asetofeasytouseinstructions providesthemeansbywhichthisfixeddatacanbereferencedandretrievedfromtheProgram Memory. Other Operations Inadditiontotheabovefunctionalinstructions,arangeofotherinstructionsalsoexistsuchas the″HALT″instructionforPower-downoperationsandinstructionstocontroltheoperationof theWatchdogTimerforreliableprogramoperationsunderextremeelectricorelectromagnetic environments.Fortheirrelevantoperations,refertothefunctionalrelatedsections. |
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