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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F2020 데이터시트(PDF) 57 Page - Holtek Semiconductor Inc |
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HT45F2020 데이터시트(HTML) 57 Page - Holtek Semiconductor Inc |
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57 / 85 page  Rev. 1.00 56 April 11, 2017 Rev. 1.00 57 April 11, 2017 HT45F2020/HT45F2022 Sound Effect Generator Flash MCU HT45F2020/HT45F2022 Sound Effect Generator Flash MCU Capture Input Mode ToselectthismodebitsPTM1andPTM0inthePTMC1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis suppliedonthePTPIorPTCKpin,selectedbythePTCAPTSbitinthePTMC1register.Theinput pinactiveedgecanbeeitherarisingedge,afallingedgeorbothrisingandfallingedges;theactive edgetransitiontypeisselectedusingthePTIO1andPTIO0bitsinthePTMC1register.Thecounter isstartedwhenthePTONbitchangesfromlowtohighwhichisinitiatedusingtheapplication program. WhentherequirededgetransitionappearsonthePTPIorPTCKpinthepresentvalueinthecounter willbelatchedintotheCCRAregistersandaPTMinterruptgenerated.Irrespectiveofwhatevents occuronthePTPIorPTCKpinthecounterwillcontinuetofreerununtilthePTONbitchanges fromhightolow.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero;inthis waytheCCRPvaluecanbeusedtocontrolthemaximumcountervalue.WhenaCCRPcompare matchoccursfromComparatorP,aPTMinterruptwillalsobegenerated.Countingthenumberof overflowinterruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths. ThePTIO1andPTIO0bitscanselecttheactivetriggeredgeonthePTPIorPTCKpintobearising edge,fallingedgeorbothedgetypes.IfthePTIO1andPTIO0bitsarebothsethigh,thennocapture operationwilltakeplaceirrespectiveofwhathappensonthePTPIorPTCKpin,howeveritmustbe notedthatthecounterwillcontinuetorun. AsthePTPIorPTCKpinispinsharedwithotherfunctions,caremustbetakenifthePTMisinthe InputCaptureMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispin maycauseaninputcaptureoperationtobeexecuted.ThePTCCLR,PTOCandPTPOLbitsarenot usedinthisMode. |
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