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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F5R 데이터시트(PDF) 76 Page - Holtek Semiconductor Inc |
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HT45F5R 데이터시트(HTML) 76 Page - Holtek Semiconductor Inc |
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76 / 138 page  Rev. 1.10 7� De�e��e� 1�� �01� Rev. 1.10 77 De�e��e� 1�� �01� 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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