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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F4MA 데이터시트(PDF) 76 Page - Holtek Semiconductor Inc |
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HT45F4MA 데이터시트(HTML) 76 Page - Holtek Semiconductor Inc |
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76 / 145 page  Rev. 1.20 7� De�e��e� 1�� 201� Rev. 1.20 77 De�e��e� 1�� 201� HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HT45F4MA/HT45FH4MA/HT45FH4MA-1 Power Bank Flash MCU HoweveracomparematchfromComparatorAwillalsoautomaticallycleartheT0ONbitandthus generatetheSinglePulseoutputtrailingedge.InthiswaytheCCRAvaluecanbeusedtocontrol thepulsewidth.AcomparematchfromComparatorAwillalsogenerateaTMinterrupt.Thecounter canonlyberesetbacktozerowhentheT0ONbitchangesfromlowtohighwhenthecounter restarts.IntheSinglePulseModeCCRPisnotused.TheT0CCLRandT0DPXbitsarenotusedin thisMode. Capture Input Mode ToselectthismodebitsT0M1andT0M0intheTM0C1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis suppliedontheTP0_0orTP0_1pin,whoseactiveedgecanbeeitherarisingedge,afallingedgeor bothrisingandfallingedges;theactiveedgetransitiontypeisselectedusingtheT0IO1andT0IO0 bitsintheTM0C1register.ThecounterisstartedwhentheT0ONbitchangesfromlowtohigh whichisinitiatedusingtheapplicationprogram. WhentherequirededgetransitionappearsontheTP0_0orTP0_1pinthepresentvalueinthe counterwillbelatchedintotheCCRAregistersandaTMinterruptgenerated.Irrespectiveofwhat eventsoccurontheTP0_0orTP0_1pinthecounterwillcontinuetofreerununtiltheTnONbit changesfromhightolow.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero; inthiswaytheCCRPvaluecanbeusedtocontrolthemaximumcountervalue.WhenaCCRP comparematchoccursfromComparatorP,aTMinterruptwillalsobegenerated.Countingthe numberofoverflowinterruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlong pulsewidths.TheTnIO1andTnIO0bitscanselecttheactivetriggeredgeontheTP0_0orTP0_1 pintobearisingedge,fallingedgeorbothedgetypes.IftheTnIO1andTnIO0bitsarebothset high,thennocaptureoperationwilltakeplaceirrespectiveofwhathappensontheTP0_0orTP0_1 pin,howeveritmustbenotedthatthecounterwillcontinuetorun. AstheTP0_0orTP0_1pinispinsharedwithotherfunctions,caremustbetakeniftheTMisinthe InputCaptureMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispin maycauseaninputcaptureoperationtobeexecuted.TheT0CCLRandT0DPXbitsarenotusedin thisMode. |
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