HT66F25D datasheet(90/177 Pages) HOLTEK

90 / 177 page

Rev. 1.00

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Rev. 1.00

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A/D Flash Type 8-bit MCU with EEPROM

HT66F24D/HT66F25D

Standard Type TM Operation Modes

TheStandardTypeTMcanoperateinoneoffiveoperatingmodes,CompareMatchOutput

Mode,PWMMode,SinglePulseOutputMode,CaptureInputModeorTimer/CounterMode.The

operatingmodeisselectedusingtheTnM1andTnM0bitsintheTMnC1register.

Compare Match Output Mode

Toselectthismode,bitsTnM1andTnM0intheTMnC1register,shouldbesetto00respectively.

Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythreemethods.Theseare

acounteroverflow,acomparematchfromComparatorAandacomparematchfromComparatorP.

WhentheTnCCLRbitislow,therearetwowaysinwhichthecountercanbecleared.Oneiswhen

acomparematchfromComparatorP,theotheriswhentheCCRPbitsareallzerowhichallows

thecountertooverflow.HerebothTnAFandTnPFinterruptrequestflagsforComparatorAand

ComparatorPrespectively,willbothbegenerated.

IftheTnCCLRbitintheTMnC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheTnAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

TnCCLRishighnoTnPFinterruptrequestflagwillbegenerated.IntheCompareMatchOutput

Mode,theCCRAcannotbesetto0.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpin,willchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenaTnAFinterruptrequestflag

isgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestflag,

generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheTMoutput

pin.ThewayinwhichtheTMoutputpinchangesstatearedeterminedbytheconditionofthe

TnIO1andTnIO0bitsintheTMnC1register.TheTMoutputpincanbeselectedusingtheTnIO1

andTnIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorA.TheinitialconditionoftheTMoutputpin,whichissetupafterthe

TnONbitchangesfromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1andTnIO0

bitsarezerothennopinchangewilltakeplace.

HT66F25D Datasheet(PDF) 90 Page - Holtek Semiconductor Inc