HT45F65 datasheet(126/231 Pages) HOLTEK

126 / 231 page

Rev. 1.60

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Rev. 1.60

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HT45F65/HT45F66/HT45F67

Glucose Meter 8-Bit Flash MCU

Compare Output Mode

Toselectthismode,bitsT1AM1,T1AM0andT1BM1,T1BM0intheTM1C1andTM1C2registers

shouldbeallclearedtozero.Inthismodeoncethecounterisenabledandrunningitcanbecleared

bythreemethods.Theseareacounteroverflow,acomparematchfromComparatorAandacompare

matchfromComparatorP.WhentheT1CCLRbitislow,therearetwowaysinwhichthecounter

canbecleared.OneiswhenacomparematchoccursfromComparatorP,theotheriswhenthe

CCRPbitsareallzerowhichallowsthecountertooverflow.HereboththeT1AFandT1PFinterrupt

requestflagsforComparatorAandComparatorPrespectively,willbothbegenerated.

IftheT1CCLRbitintheTM1C1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheT1AFinterruptrequestflagwillbe

generatedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Thereforewhen

T1CCLRishighnoT1PFinterruptrequestflagwillbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theTMoutputpin,willchange

state.TheTMoutputpinconditionhoweveronlychangesstatewhenaT1AForT1BFinterrupt

requestflagisgeneratedafteracomparematchoccursfromComparatorAorComparatorB.The

T1PFinterruptrequestflag,generatedfromacomparematchfromComparatorP,willhaveno

effectontheTMoutputpin.ThewayinwhichtheTMoutputpinchangesstateisdeterminedbythe

conditionoftheT1AIO1andT1AIO0bitsintheTM1C1registerforETMCCRA,andtheT1BIO1

andT1BIO0bitsintheTM1C2registerforETMCCRB.TheTMoutputpincanbeselectedusing

theT1AIO1,T1AIO0bits(fortheTP1Apin)andT1BIO1,T1BIO0bits(fortheTP1B_0,TP1B_1

orTP1B_2pins)togohigh,togolowortotogglefromitspresentconditionwhenacomparematch

occursfromComparatorAoracomparematchoccursfromComparatorB.Theinitialconditionof

theTMoutputpin,whichissetupaftertheT1ONbitchangesfromlowtohigh,issetupusingthe

T1AOCorT1BOCbitforTP1AorTP1B_0,TP1B_1,TP1B_2outputpins.NotethatiftheT1AIO1,

T1AIO0andT1BIO1,T1BIO0bitsarezerothennopinchangewilltakeplace.

HT45F65 Datasheet(PDF) 126 Page - Holtek Semiconductor Inc