HT45F5R datasheet(76/138 Pages) HOLTEK

76 / 138 page

Rev. 1.10

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HT45F5R

Charger ASSP Flash MCU

HT45F5R

Charger ASSP Flash MCU

Capture Input Mode

ToselectthismodebitsSTM1andSTM0intheSTMC1registershouldbesetto01respectively.

Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter

andcanthereforebeusedforapplicationssuchaspulsewidthmeasurement.Theexternalsignalis

suppliedontheSTPI,whoseactiveedgecanbeeitherarisingedge,afallingedgeorbothrising

andfallingedges;theactiveedgetransitiontypeisselectedusingtheSTIO1andSTIO0bitsin

theSTMC1register.ThecounterisstartedwhentheSTONbitchangesfromlowtohighwhichis

initiatedusingtheapplicationprogram.

WhentherequirededgetransitionappearsontheSTPIthepresentvalueinthecounterwillbe

latchedintotheCCRAregistersandaSTMinterruptgenerated.Irrespectiveofwhateventsoccuron

theSTPIthecounterwillcontinuetofreerununtiltheSTONbitchangesfromhightolow.Whena

CCRPcomparematchoccursthecounterwillresetbacktozero;inthiswaytheCCRPvaluecanbe

usedtocontrolthemaximumcountervalue.WhenaCCRPcomparematchoccursfromComparator

P,aSTMinterruptwillalsobegenerated.Countingthenumberofoverflowinterruptsignalsfrom

theCCRPcanbeausefulmethodinmeasuringlongpulsewidths.TheSTIO1andSTIO0bitscan

selecttheactivetriggeredgeontheSTPItobearisingedge,fallingedgeorbothedgetypes.If

theSTIO1andSTIO0bitsarebothsethigh,thennocaptureoperationwilltakeplaceirrespective

ofwhathappensontheSTPI,howeveritmustbenotedthatthecounterwillcontinuetorun.The

STCCLRandSTDPXbitsarenotusedinthisMode.

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