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Rev. 1.50 108 August 28, 2017 Rev. 1.50 109 August 28, 2017

HT66F0175/HT66F0185

A/D Flash MCU with EEPROM

HT66F0175/HT66F0185

A/D Flash MCU with EEPROM

Periodic Type TM Operation Modes

ThePeriodicTypeTMcanoperateinoneofveoperatingmodes,CompareMatchOutputMode,

PWMOutputMode,SinglePulseOutputMode,CaptureInputModeorTimer/CounterMode.The

operatingmodeisselectedusingtheTnM1andTnM0bitsintheTMnC1register.

Compare Match Output Mode

Toselectthismode,bitsTnM1andTnM0intheTMnC1register,shouldbesetto00respectively.

Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythreemethods.Theseare

acounteroverow,acomparematchfromComparatorAandacomparematchfromComparatorP.

WhentheTnCCLRbitislow,therearetwowaysinwhichthecountercanbecleared.Oneiswhen

acomparematchfromComparatorP,theotheriswhentheCCRPbitsareallzerowhichallows

thecountertooverow.HerebothTnAFandTnPFinterruptrequestagsforComparatorAand

ComparatorPrespectively,willbothbegenerated.

IftheTnCCLRbitintheTMnC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheTnAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

TnCCLRishighnoTnPFinterruptrequestagwillbegenerated.IntheCompareMatchOutput

Mode,theCCRAcannotbesetto“0”.

Asthenameofthemodesuggests,afteracomparisonismade,theTMnoutputpinwillchange

state.TheTMnoutputpinconditionhoweveronlychangesstatewhenaTnAFinterruptrequest

agisgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestag,

generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheTMnoutput

pin.ThewayinwhichtheTMnoutputpinchangesstatearedeterminedbytheconditionofthe

TnIO1andTnIO0bitsintheTMnC1register.TheTMnoutputpincanbeselectedusingtheTnIO1

andTnIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorA.TheinitialconditionoftheTMnoutputpin,whichissetupafterthe

TnONbitchangesfromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1andTnIO0

bitsarezerothennopinchangewilltakeplace.

Holtek HT66F0175 User Manual

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