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HT66F4530 bảng dữ liệu(PDF) 105 Page - Holtek Semiconductor Inc |
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HT66F4530 bảng dữ liệu(HTML) 105 Page - Holtek Semiconductor Inc |
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105 / 224 page  Rev. 1.00 104 De�e��e� �1� �01� Rev. 1.00 105 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 ToselectthismodebitsSTnM1andSTnM0intheSTMnC1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignal issuppliedontheSTPnIpin,whoseactiveedgecanbearisingedge,afallingedgeorbothrising andfallingedges;theactiveedgetransitiontypeisselectedusingtheSTnIO1andSTnIO0bitsin theSTMnC1register.ThecounterisstartedwhentheSTnONbitchangesfromlowtohighwhichis initiatedusingtheapplicationprogram. WhentherequirededgetransitionappearsontheSTPnIpinthepresentvalueinthecounterwillbe latchedintotheCCRAregistersandaSTMninterruptgenerated.Irrespectiveofwhateventsoccur ontheSTPnIpinthecounterwillcontinuetofreerununtiltheSTnONbitchangesfromhighto low.WhenaCCRPcomparematchoccursthecounterwillresetbacktozero;inthiswaytheCCRP valuecanbeusedtocontrolthemaximumcountervalue.WhenaCCRPcomparematchoccursfrom ComparatorP,aSTMninterruptwillalsobegenerated.Countingthenumberofoverflowinterrupt signalsfromtheCCRPcanbeausefulmethodinmeasuringlongpulsewidths.TheSTnIO1and STnIO0bitscanselecttheactivetriggeredgeontheSTPnIpintobearisingedge,fallingedgeor bothedgetypes.IftheSTnIO1andSTnIO0bitsarebothsethigh,thennocaptureoperationwill takeplaceirrespectiveofwhathappensontheSTPnIpin,howeveritmustbenotedthatthecounter willcontinuetorun.TheSTnCCLRandSTnDPXbitsarenotusedinthisMode. |
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