HT45F75 datasheet(97/190 Pages) HOLTEK

97 / 190 page

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HT45F75

Body Fat Scale Flash MCU

HT45F75

Body Fat Scale Flash MCU

Capture Input Mode

ToselectthismodebitsTnM1andTnM0inthePTMnC1registershouldbesetto01respectively.

Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter

andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis

suppliedontheTPn_0,TPn_1orTCKnpin,selectedbytheTnCAPTSbitinthePTMnC1register.

Theinputpinactiveedgecanbeeitherarisingedge,afallingedgeorbothrisingandfallingedges;

theactiveedgetransitiontypeisselectedusingtheTnIO1andTnIO0bitsinthePTMnC1register.

ThecounterisstartedwhentheTnONbitchangesfromlowtohighwhichisinitiatedusingthe

applicationprogram.

WhentherequirededgetransitionappearsontheTPn_0,TPn_1orTCKnpinthepresentvaluein

thecounterwillbelatchedintotheCCRAregisterandaTMinterruptgenerated.Irrespectiveof

whateventsoccurontheTPn_0,TPn_1orTCKnpinthecounterwillcontinuetofreerununtilthe

TnONbitchangesfromhightolow.WhenaCCRPcomparematchoccursthecounterwillreset

backtozero;inthiswaytheCCRPvaluecanbeusedtocontrolthemaximumcountervalue.When

aCCRPcomparematchoccursfromComparatorP,aTMinterruptwillalsobegenerated.Counting

thenumberofoverflowinterruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlong

pulsewidths.TheTnIO1andTnIO0bitscanselecttheactivetriggeredgeontheTPn_0,TPn_1

orTCKnpintobearisingedge,fallingedgeorbothedgetypes.IftheTnIO1andTnIO0bitsare

bothsethigh,thennocaptureoperationwilltakeplaceirrespectiveofwhathappensontheTPn_0,

TPn_1orTCKnpin,howeveritmustbenotedthatthecounterwillcontinuetorun.

AstheTPn_0,TPn_1orTCKnpinispinsharedwithotherfunctions,caremustbetakeniftheTMn

isintheCaptureInputMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionson

thispinmaycauseaninputcaptureoperationtobeexecuted.TheTnCCLR,TnOCandTnPOLbits

arenotusedinthisMode.

HT45F75 Datasheet(PDF) 97 Page - Holtek Semiconductor Inc