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Rev. 1.71 74 April 11, 2017 Rev. 1.71 75 April 11, 2017

HT66F002/HT66F0025/HT66F003/HT66F004

Cost-Effective A/D Flash MCU with EEPROM

HT66F002/HT66F0025/HT66F003/HT66F004

Cost-Effective A/D Flash MCU with EEPROM

Standard Type TM Operating Modes

TheStandardTypeTMcanoperateinoneofveoperatingmodes,CompareMatchOutputMode,

PWMOutputMode,SinglePulseOutputMode,CaptureInputModeorTimer/CounterMode.The

operatingmodeisselectedusingtheST0M1andST0M0bitsintheSTM0C1register.

Compare Output Mode

Toselectthismode,bitsST0M1andST0M0intheSTM0C1register,shouldbesetto00

respectively.Inthismodeoncethecounterisenabledandrunningitcanbeclearedbythree

methods.Theseareacounteroverow,acomparematchfromComparatorAandacomparematch

fromComparatorP.WhentheST0CCLRbitislow,therearetwowaysinwhichthecountercanbe

cleared.OneiswhenacomparematchfromComparatorP,theotheriswhentheCCRPbitsareall

zerowhichallowsthecountertooverow.HerebothSTMA0FandSTMP0Finterruptrequestags

forComparatorAandComparatorPrespectively,willbothbegenerated.

IftheST0CCLRbitintheSTM0C1registerishighthenthecounterwillbeclearedwhenacompare

matchoccursfromComparatorA.However,hereonlytheSTMA0Finterruptrequestflagwill

begeneratedevenifthevalueoftheCCRPbitsislessthanthatoftheCCRAregisters.Therefore

whenST0CCLRishighnoSTMP0Finterruptrequestflagwillbegenerated.IntheCompare

MatchOutputMode,theCCRAcannotbesetto"0".IftheCCRAbitsareallzero,thecounterwill

overowwhenitsreachesitsmaximum10-bit,3FFHex,value,howeverheretheSTMA0Finterrupt

requestagwillnotbegenerated.

Asthenameofthemodesuggests,afteracomparisonismade,theSTMoutputpin,willchange

state.TheSTMoutputpinconditionhoweveronlychangesstatewhenanSTMA0Finterruptrequest

agisgeneratedafteracomparematchoccursfromComparatorA.TheSTMP0Finterruptrequest

ag,generatedfromacomparematchoccursfromComparatorP,willhavenoeffectontheSTM

outputpin.ThewayinwhichtheSTMoutputpinchangesstatearedeterminedbytheconditionof

theST0IO1andST0IO0bitsintheSTM0C1register.TheSTMoutputpincanbeselectedusing

theST0IO1andST0IO0bitstogohigh,togolowortotogglefromitspresentconditionwhena

comparematchoccursfromComparatorA.TheinitialconditionoftheSTMoutputpin,whichis

setupaftertheST0ONbitchangesfromlowtohigh,issetupusingtheST0OCbit.Notethatifthe

ST0IO1andST0IO0bitsarezerothennopinchangewilltakeplace.

Holtek HT66F004 User Manual

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