HT66F20 datasheet(154/298 Pages) HOLTEK

154 / 298 page

Rev. 1.90

154

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Rev. 1.90

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HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

HT66F20/HT66F30/HT66F40/HT66F50/HT66F60

HT66FU30/HT66FU40/HT66FU50/HT66FU60

Enhanced A/D Flash Type 8-Bit MCU with EEPROM

Compare Output Mode

Toselectthismode,bitsTnAM1,TnAM0andTnBM1,TnBM0intheTMnC1/TMnC2registers

shouldbeallclearedtozero.Inthismodeoncethecounterisenabledandrunningitcanbecleared

bythreemethods.Theseareacounteroverflow,acomparematchfromComparatorAandacompare

matchfromComparatorP.WhentheTnCCLRbitislow,therearetwowaysinwhichthecounter

canbecleared.OneiswhenacomparematchoccursfromComparatorP,theotheriswhenthe

CCRPbitsareallzerowhichallowsthecountertooverflow.HereboththeTnAFandTnPFinterrupt

requestflagsforComparatorAandComparatorPrespectively,willbothbegenerated.

IftheTnCCLRbitintheTMnC1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheTnAFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

TnCCLRishighnoTnPFinterruptrequestflagwillbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpin,willchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenanTnAForTnBFinterrupt

requestflagisgeneratedafteracomparematchoccursfromComparatorAorComparatorB.The

TnPFinterruptrequestflag,generatedfromacomparematchfromComparatorP,willhaveno

effectontheTMoutputpin.ThewayinwhichtheTMoutputpinchangesstateisdeterminedbythe

conditionoftheTnAIO1andTnAIO0bitsintheTMnC1registerforETMCCRA,andtheTnBIO1

andTnBIO0bitsintheTMnC2registerforETMCCRB.TheTMoutputpincanbeselectedusing

theTnAIO1,TnAIO0bits(fortheTPnApin)andTnBIO1,TnBIO0bits(fortheTPnB_0,TPnB_1

orTPnB_2pins)togohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorAoracomparematchoccursfromComparatorB.Theinitialconditionof

theTMoutputpin,whichissetupaftertheTnONbitchangesfromlowtohigh,issetupusingthe

TnAOCorTnBOCbitforTPnAorTPnB_0,TPnB_1,TPnB_2outputpins.NotethatiftheTnAIO1,

TnAIO0andTnBIO1,TnBIO0bitsarezerothennopinchangewilltakeplace.

HT66F20 Datasheet(PDF) 154 Page - Holtek Semiconductor Inc