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HT46R002 датащи(PDF) 64 Page - Holtek Semiconductor Inc

номер детали HT46R002
подробное описание детали  Cost-Effective A/D 8-Bit OTP MCU
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производитель  HOLTEK [Holtek Semiconductor Inc]
домашняя страница  http://www.holtek.com
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HT46R002 датащи(HTML) 64 Page - Holtek Semiconductor Inc

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Rev. 1.21
64
April 11, 2017
Rev. 1.21
65
April 11, 2017
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
HT46R002/HT46R003
Cost-Effective A/D 8-Bit OTP MCU
Logical and Rotate Operation
ThestandardlogicaloperationssuchasAND,OR,XORandCPLallhavetheirowninstruction
withintheHoltekmicrocontrollerinstructionset.Aswiththecaseofmostinstructionsinvolving
datamanipulation,datamustpassthroughtheAccumulatorwhichmayinvolveadditional
programmingsteps.Inalllogicaldataoperations,thezeroflagmaybesetiftheresultofthe
operationiszero.Anotherformoflogicaldatamanipulationcomesfromtherotateinstructionssuch
asRR,RL,RRCandRLCwhichprovideasimplemeansofrotatingonebitrightorleft.Different
rotateinstructionsexistdependingonprogramrequirements.Rotateinstructionsareusefulforserial
portprogrammingapplicationswheredatacanberotatedfromaninternalregisterintotheCarry
bitfromwhereitcanbeexaminedandthenecessaryserialbitsethighorlow.Anotherapplication
whichrotatedataoperationsareusedistoimplementmultiplicationanddivisioncalculations.
Branches and Control Transfer
ProgrambranchingtakestheformofeitherjumpstospecifiedlocationsusingtheJMPinstruction
ortoasubroutineusingtheCALLinstruction.Theydifferinthesensethatinthecaseofa
subroutinecall,theprogrammustreturntotheinstructionimmediatelywhenthesubroutinehas
beencarriedout.Thisisdonebyplacingareturninstruction“RET”inthesubroutinewhichwill
causetheprogramtojumpbacktotheaddressrightaftertheCALLinstruction.InthecaseofaJMP
instruction,theprogramsimplyjumpstothedesiredlocation.Thereisnorequirementtojumpback
totheoriginaljumpingoffpointasinthecaseoftheCALLinstruction.Onespecialandextremely
usefulsetofbranchinstructionsaretheconditionalbranches.Hereadecisionisfirstmaderegarding
theconditionofacertaindatamemoryorindividualbits.Dependingupontheconditions,the
programwillcontinuewiththenextinstructionorskipoveritandjumptothefollowinginstruction.
Theseinstructionsarethekeytodecisionmakingandbranchingwithintheprogramperhaps
determinedbytheconditionofcertaininputswitchesorbytheconditionofinternaldatabits.
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
Memorytobesetasatablewheredatacanbedirectlystored.Asetofeasytouseinstructions
providesthemeansbywhichthisfixeddatacanbereferencedandretrievedfromtheProgram
Memory.
Other Operations
Inadditiontotheabovefunctionalinstructions,arangeofotherinstructionsalsoexistsuchas
the“HALT”instructionforPower-downoperationsandinstructionstocontroltheoperationof
theWatchdogTimerforreliableprogramoperationsunderextremeelectricorelectromagnetic
environments.Fortheirrelevantoperations,refertothefunctionalrelatedsections.


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Аналогичное описание - HT46R002

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