HT66F4530 datasheet(198/224 Pages) HOLTEK

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Rev. 1.00

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HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

HT66F4530/HT66F4540/HT66F4550

A/D Flash MCU with Dual Operational Amplifiers

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-Bit

outputport,manipulatetheinputdatatoensurethatotherBitsarenotchangedandthenoutputthe

portwiththecorrectnewdata.Thisread-modify-writeprocessistakencareofautomaticallywhen

theseBitoperationinstructionsareused.

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.

HT66F4530 Datasheet(PDF) 198 Page - Holtek Semiconductor Inc

HT66F4530 Datasheet(HTML) 198 Page - Holtek Semiconductor Inc

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