HT66F319 datasheet(92/185 Pages) HOLTEK

92 / 185 page

Rev. 1.20

De�e��e� 0�� 201�

Rev. 1.20

De�e��e� 0�� 201�

HT66F319

Enhanced A/D Flash MCU with EEPROM and UART

HT66F319

Enhanced A/D Flash MCU with EEPROM and UART

Capture Input Mode

ToselectthismodebitsTnM1andTnM0intheTMnC1registershouldbesetto01respectively.

Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter

andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignal

issuppliedontheTPnpin,whoseactiveedgecanbearisingedge,afallingedgeorbothrising

andfallingedges;theactiveedgetransitiontypeisselectedusingtheTnIO1andTnIO0bitsin

theTMnC1register.ThecounterisstartedwhentheTnONbitchangesfromlowtohighwhichis

initiatedusingtheapplicationprogram.

WhentherequirededgetransitionappearsontheTPnpinthepresentvalueinthecounterwillbe

latchedintotheCCRAregistersandaTMinterruptgenerated.Irrespectiveofwhateventsoccuron

theTPnpinthecounterwillcontinuetofreerununtiltheTnONbitchangesfromhightolow.When

aCCRPcomparematchoccursthecounterwillresetbacktozero;inthiswaytheCCRPvalue

canbeusedtocontrolthemaximumcountervalue.WhenaCCRPcomparematchoccursfrom

ComparatorP,aTMinterruptwillalsobegenerated.Countingthenumberofoverflowinterrupt

signalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.TheTnIO1and

TnIO0bitscanselecttheactivetriggeredgeontheTPnpintobearisingedge,fallingedgeorboth

edgetypes.IftheTnIO1andTnIO0bitsarebothsethigh,thennocaptureoperationwilltakeplace

irrespectiveofwhathappensontheTPnpin,howeveritmustbenotedthatthecounterwillcontinue

torun.

AstheTPnpinispinsharedwithotherfunctions,caremustbetakeniftheTMisintheInput

CaptureMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispinmay

causeaninputcaptureoperationtobeexecuted.TheTnCCLRandTnDPXbitsarenotusedinthis

Mode.

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