HT45F77 datasheet(82/203 Pages) HOLTEK

82 / 203 page

Rev. 1.20

De�e��e� 1�� 201�

Rev. 1.20

De�e��e� 1�� 201�

HT45F77

Body Fat Scale Flash MCU

HT45F77

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

counterwilloverflowwhenitsreachesitsmaximum10-bit,3FFHex,value,howeverheretheTnAF

interruptrequestflagwillnotbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpinwillchangestate.

TheTMoutputpinconditionhoweveronlychangesstatewhenanTnAFinterruptrequestflag

isgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestflag,

generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheTMoutput

pin.ThewayinwhichtheTMoutputpinchangesstatearedeterminedbytheconditionofthe

TnIO1andTnIO0bitsintheTMnC1register.TheTMoutputpincanbeselectedusingtheTnIO1

andTnIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorA.TheinitialconditionoftheTMoutputpin,whichissetupafterthe

TnONbitchangesfromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1andTnIO0

bitsarezerothennopinchangewilltakeplace.

HT45F77 Datasheet(PDF) 82 Page - Holtek Semiconductor Inc