HT67F488 datasheet(72/171 Pages) HOLTEK

72 / 171 page

Rev. 1.60

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Periodic Type TM Operating Modes

ThePeriodicTypeTMcanoperateinoneoffiveoperatingmodes,CompareMatchOutputMode,

PWMOutputMode,SinglePulseOutputMode,CaptureInputModeorTimer/CounterMode.The

operatingmodeisselectedusingtheTnM1andTnM0bitsintheTMnC1register.

Compare Match Output Mode

Toselectthismode,bitsTnM1andTnM0intheTMnC1register,shouldbeallclearedto00

respectively.Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythree

methods.Theseareacounteroverflow,acomparematchfromComparatorAandacomparematch

fromComparatorP.WhentheTnCCLRbitislow,therearetwowaysinwhichthecountercanbe

cleared.OneiswhenacomparematchoccursfromComparatorP,theotheriswhentheCCRPbits

areallzerowhichallowsthecountertooverflow.HereboththeTnAFandTnPFinterruptrequest

flagsforComparatorAandComparatorPrespectively,willbothbegenerated.

IftheTnCCLRbitintheTMnC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheTnAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

TnCCLRishighnoTnPFinterruptrequestflagwillbegenerated.IntheCompareMatchOutput

Mode,theCCRAcannotbesetto“0”.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpin,willchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenaTnAFinterruptrequestflag

isgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestflag,

generatedfromacomparematchfromComparatorP,willhavenoeffectontheTMoutputpin.The

wayinwhichtheTMoutputpinchangesstatearedeterminedbytheconditionoftheTnIO1and

TnIO0bitsintheTMnC1register.TheTMoutputpincanbeselectedusingtheTnIO1andTnIO0

bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematchoccursfrom

ComparatorA.TheinitialconditionoftheTMoutputpin,whichissetupaftertheTnONbitchanges

fromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1,TnIO0bitsarezerothenno

pinchangewilltakeplace.

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