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HT66F019 Datasheet(PDF) 87 Page - Holtek Semiconductor Inc |
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HT66F019 Datasheet(HTML) 87 Page - Holtek Semiconductor Inc |
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87 / 175 page  Rev. 1.00 86 De�e��e� 01� �01� Rev. 1.00 8� De�e��e� 01� �01� HT66F019 A/D Flash MCU with EEPROM HT66F019 A/D Flash MCU with EEPROM Capture Input Mode ToselectthismodebitsSTM1andSTM0intheSTMC1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignal issuppliedontheSTPpin,whoseactiveedgecanbearisingedge,afallingedgeorbothrising andfallingedges;theactiveedgetransitiontypeisselectedusingtheSTIO1andSTIO0bitsin theSTMC1register.ThecounterisstartedwhentheSTONbitchangesfromlowtohighwhichis initiatedusingtheapplicationprogram. WhentherequirededgetransitionappearsontheSTPpinthepresentvalueinthecounterwillbe latchedintotheCCRAregistersandaSTMinterruptgenerated.Irrespectiveofwhateventsoccuron theSTPpinthecounterwillcontinuetofreerununtiltheSTONbitchangesfromhightolow.When aCCRPcomparematchoccursthecounterwillresetbacktozero;inthiswaytheCCRPvalue canbeusedtocontrolthemaximumcountervalue.WhenaCCRPcomparematchoccursfrom ComparatorP,aSTMinterruptwillalsobegenerated.Countingthenumberofoverflowinterrupt signalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.TheSTIO1and STIO0bitscanselecttheactivetriggeredgeontheSTPpintobearisingedge,fallingedgeorboth edgetypes.IftheSTIO1andSTIO0bitsarebothsethigh,thennocaptureoperationwilltakeplace irrespectiveofwhathappensontheSTPpin,howeveritmustbenotedthatthecounterwillcontinue torun.TheSTCCLRandSTDPXbitsarenotusedinthismode. |
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