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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT69F360 датащи(PDF) 145 Page - Holtek Semiconductor Inc |
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HT69F360 датащи(HTML) 145 Page - Holtek Semiconductor Inc |
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145 / 235 page  Rev. 1.30 144 �ove��e� 1�� �01� Rev. 1.30 145 �ove��e� 1�� �01� HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM HT69F340/HT69F350/HT69F360 TinyPowerTM I/O Flash MCU with LCD & EEPROM Capture Input Mode ToselectthismodebitsPTnM1andPTnM0inthePTMnC1registershouldbesetto01respectively. Thismodeenablesexternalsignalstocaptureandstorethepresentvalueoftheinternalcounter andcanthereforebeusedforapplicationssuchaspulsewidthmeasurements.Theexternalsignalis suppliedonthePTPnorPTCKnpin,selectedbythePTnCKSbitinthePTMnC1register.Theinput pinactiveedgecanbearisingedge,afallingedgeorbothrisingandfallingedges;theactiveedge transitiontypeisselectedusingthePTnIO1andPTnIO0bitsinthePTMnC1register.Thecounter isstartedwhenthePTnONbitchangesfromlowtohighwhichisinitiatedusingtheapplication program. WhentherequirededgetransitionappearsonthePTPnorPTCKnpinthepresentvalueinthe counterwillbelatchedintotheCCRAregistersandaTMinterruptgenerated.Irrespectiveofwhat eventsoccuronthePTPnorPTCKnpinthecounterwillcontinuetofreerununtilthePTnON bitchangesfromhightolow.WhenaCCRPcomparematchoccursthecounterwillresetback tozero;inthiswaytheCCRPvaluecanbeusedtocontrolthemaximumcountervalue.Whena CCRPcomparematchoccursfromComparatorP,aTMinterruptwillalsobegenerated.Counting thenumberofoverflowinterruptsignalsfromtheCCRPcanbeausefulmethodinmeasuringlong pulsewidths.ThePTnIO1andPTnIO0bitscanselecttheactivetriggeredgeonthePTPnorPTCKn pintobearisingedge,fallingedgeorbothedgetypes.IfthePTnIO1andPTnIO0bitsarebothset high,thennocaptureoperationwilltakeplaceirrespectiveofwhathappensonthePTPnorPTCKn pin,howeveritmustbenotedthatthecounterwillcontinuetorun. AsthePTPnpinispinorPTCKnpinsharedwithotherfunctions,caremustbetakenifthePTMn isintheInputCaptureMode.Thisisbecauseifthepinissetupasanoutput,thenanytransitionson thispinmaycauseaninputcaptureoperationtobeexecuted.ThePTnCCLR,PTnOCandPTnPOL bitsarenotusedinthisMode. |
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