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HT66F4530 bảng dữ liệu(PDF) 119 Page - Holtek Semiconductor Inc |
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HT66F4530 bảng dữ liệu(HTML) 119 Page - Holtek Semiconductor Inc |
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119 / 224 page  Rev. 1.00 118 De�e��e� �1� �01� Rev. 1.00 119 De�e��e� �1� �01� HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers HT66F4530/HT66F4540/HT66F4550 A/D Flash MCU with Dual Operational Amplifiers Capture Input Mode ToselectthismodebitsPTnM1andPTnM0inthePTMnC1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis suppliedonthePTCKnpinwhichisselectedusingthePTnCAPTSbitinthePTMnC1register.The inputpinactiveedgecanbeeitherarisingedge,afallingedgeorbothrisingandfallingedges;the activeedgetransitiontypeisselectedusingthePTnIO1andPTnIO0bitsinthePTMnC1register. ThecounterisstartedwhenthePTnONbitchangesfromlowtohighwhichisinitiatedusingthe applicationprogram. WhentherequirededgetransitionappearsonthePTCKnpinthepresentvalueinthecounterwillbe latchedintotheCCRAregistersandaPTMninterruptgenerated.Irrespectiveofwhateventsoccur onthePTCKnpin,thecounterwillcontinuetofreerununtilthePTnONbitchangesfromhighto low.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero;inthiswaytheCCRP valuecanbeusedtocontrolthemaximumcountervalue.WhenaCCRPcomparematchoccursfrom ComparatorP,aPTMninterruptwillalsobegenerated.Countingthenumberofoverflowinterrupt signalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.ThePTnIO1and PTnIO0bitscanselecttheactivetriggeredgeonthePTCKnpintobearisingedge,fallingedgeor bothedgetypes.IfthePTnIO1andPTnIO0bitsarebothsethigh,thennocaptureoperationwill takeplaceirrespectiveofwhathappensonthePTCKnpin,howeveritmustbenotedthatthecounter willcontinuetorun. AsthePTCKnpinispinsharedwithotherfunctions,caremustbetakenifthePTMnisinthe CaptureInputMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionsonthispin maycauseaninputcaptureoperationtobeexecuted.ThePTnCCLR,PTnOCandPTnPOLbitsare notusedinthisMode. |
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