HT67F488 datasheet(86/171 Pages) HOLTEK

86 / 171 page

Rev. 1.60

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Compact Type TM Operating Modes

TheCompactTypeTMcanoperateinoneofthreeoperatingmodes,CompareMatchOutputMode,

PWMOutputModeorTimer/CounterMode.TheoperatingmodeisselectedusingtheTnM1and

TnM0bitsintheTMnC1register.

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,theTMoutputpinwillchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenaTnAFinterruptrequestflag

isgeneratedafteracomparematchoccursfromComparatorA.TheTnPFinterruptrequestflag,

generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheTMoutput

pin.ThewayinwhichtheTMoutputpinchangesstatearedeterminedbytheconditionofthe

TnIO1andTnIO0bitsintheTMnC1register.TheTMoutputpincanbeselectedusingtheTnIO1

andTnIO0bitstogohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorA.TheinitialconditionoftheTMoutputpin,whichissetupafterthe

TnONbitchangesfromlowtohigh,issetupusingtheTnOCbit.NotethatiftheTnIO1andTnIO0

bitsarezerothennopinchangewilltakeplace.

HT67F488 датащи(PDF) 86 Page - Holtek Semiconductor Inc