HT45F75 datasheet(79/190 Pages) HOLTEK

79 / 190 page

Rev. 1.10

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Rev. 1.10

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Compact Type TM Operating Modes

TheCompactTypeTMcanoperateinoneofthreeoperatingmodes,CompareMatchOutputMode,

PWMModeorTimer/CounterMode.TheoperatingmodeisselectedusingtheTnM1andTnM0

bitsintheTMnC1register.

Compare Match Output Mode

Toselectthismode,bitsTnM1andTnM0intheTMnC1register,shouldbesetto00respectively.

Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythreemethods.Theseare

acounteroverflow,acomparematchfromComparatorAandacomparematchfromComparatorP.

WhentheTnCCLRbitislow,therearetwowaysinwhichthecountercanbecleared.Oneiswhen

acomparematchoccursfromComparatorP,theotheriswhentheCCRPbitsareallzerowhich

allowsthecountertooverflow.HerebothTnAFandTnPFinterruptrequestflagsfortheComparator

AandComparatorPrespectively,willbothbegenerated.

IftheTnCCLRbitintheTMnC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheTnAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

TnCCLRishighnoTnPFinterruptrequestflagwillbegenerated.IftheCCRAbitsareallzero,the

counterwilloverflowwhenitreachesitsmaximum10-bit,3FFHex,value,howeverheretheTnAF

interruptrequestflagwillnotbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpinwillchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenaTnAFinterruptrequestflag

isgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestflag,

generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheTMoutput

pin.ThewayinwhichtheTMoutputpinchangesstatearedeterminedbytheconditionofthe

TnIO1andTnIO0bitsintheTMnC1register.TheTMoutputpincanbeselectedusingtheTnIO1

andTnIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorA.TheinitialconditionoftheTMoutputpin,whichissetupafterthe

TnONbitchangesfromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1andTnIO0

bitsarezerothennopinchangewilltakeplace.

HT45F75 Datenblatt(PDF) 79 Page - Holtek Semiconductor Inc