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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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HT45F4M Fiches technique(PDF) 84 Page - Holtek Semiconductor Inc |
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HT45F4M Fiches technique(HTML) 84 Page - Holtek Semiconductor Inc |
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84 / 138 page  Rev. 1.10 84 �an�a�� 1�� �01� Rev. 1.10 8� �an�a�� 1�� �01� HT45F4M Lithium Battery Backup Power ASSP MCU HT45F4M Lithium Battery Backup Power ASSP MCU Capture Input Mode ToselectthismodebitsT1M1andT1M0intheTM1C1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis suppliedontheTP1orTCK1pin,selectedbytheT1CAPTSbitintheTM1C0register.Theinput pinactiveedgecanbeeitherarisingedge,afallingedgeorbothrisingandfallingedges;theactive edgetransitiontypeisselectedusingtheT1IO1andT1IO0bitsintheTM1C1register.Thecounter isstartedwhentheT1ONbitchangesfromlowtohighwhichisinitiatedusingtheapplication program. WhentherequirededgetransitionappearsontheTP1orTCK1pinthepresentvalueinthecounter willbelatchedintotheCCRAregistersandaTMinterruptgenerated.Irrespectiveofwhatevents occurontheTP1orTCK1pinthecounterwillcontinuetofreerununtiltheT1ONbitchangesfrom hightolow.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero;inthisway theCCRPvaluecanbeusedtocontrolthemaximumcountervalue.WhenaCCRPcomparematch occursfromComparatorP,aTMinterruptwillalsobegenerated.Countingthenumberofoverflow interruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.TheT1IO1 andT1IO0bitscanselecttheactivetriggeredgeontheTP1orTCK1pintobearisingedge,falling edgeorbothedgetypes.IftheT1IO1andT1IO0bitsarebothsethigh,thennocaptureoperation willtakeplaceirrespectiveofwhathappensontheTP1orTCK1pin,howeveritmustbenotedthat thecounterwillcontinuetorun. AstheTP1orTCK1pinispinsharedwithotherfunctions,caremustbetakeniftheTM1isinthe InputCaptureMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispin maycauseaninputcaptureoperationtobeexecuted.TheT1CCLR,T1OCandT1POLbitsarenot usedinthisMode. |
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