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HT82B42R Datenblatt(PDF) 33 Page - Holtek Semiconductor Inc |
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HT82B42R Datenblatt(HTML) 33 Page - Holtek Semiconductor Inc |
33 / 84 page Rev. 1.10 3� �ove��e� 0�� �01� Rev. 1.10 33 �ove��e� 0�� �01� HT82B42R/HT82B42RE I/O MCU with USB Interface Ti me r+ 2 Ex te rn al E ve nt In cr em en t Ti me r C oun te r Ti me r+ 3 Ti me r+ 1 Event Counter Mode Timing Chart Configuring the Pulse Width Measurement Mode Inthismode,theTimer/EventCountercanbeutilisedtomeasurethewidthofexternalpulses appliedtotheexternaltimerpin.Tooperateinthismode,theOperatingModeSelectbitpair, T0M1/T0M0orT1M1/T1M0,intheTimerControlRegistermustbesettothecorrectvalueas shown. Cont�ol Registe� Ope�ating Mode Select Bits fo� the Pulse Width Captu�e Mode Bit7 Bit6 1 1 Inthismodetheinternalclock,fSYS/4isusedastheinternalclockfortheTimer/EventCounters. AftertheotherbitsintheTimerControlRegisterhavebeensetup,theenablebitT0ONorT1ON, whichisbit4oftheTimerControlRegister,canbesethightoenabletheTimer/EventCounter, howeveritwillnotactuallystartcountinguntilanactiveedgeisreceivedontheexternaltimerpin. IftheActiveEdgeSelectbitT0EorT1E,whichisbit3oftheTimerControlRegister,islow,oncea hightolowtransitionhasbeenreceivedontheexternaltimerpin,TMR0orTMR1,theTimer/Event Counterwillstartcountinguntiltheexternaltimerpinreturnstoitsoriginalhighlevel.Atthispoint theenablebitwillbeautomaticallyresettozeroandtheTimer/EventCounterwillstopcounting.If theActiveEdgeSelectbitishigh,theTimer/EventCounterwillbegincountingoncealowtohigh transitionhasbeenreceivedontheexternaltimerpinandstopcountingwhentheexternaltimerpin returnstoitsoriginallowlevel.Asbefore,theenablebitwillbeautomaticallyresettozeroandthe Timer/EventCounterwillstopcounting.ItisimportanttonotethatinthePulseWidthMeasurement Mode,theenablebitisautomaticallyresettozerowhentheexternalcontrolsignalontheexternal timerpinreturnstoitsoriginallevel,whereasintheothertwomodestheenablebitcanonlybereset tozerounderprogramcontrol. TheresidualvalueintheTimer/EventCounter,whichcannowbereadbytheprogram,therefore representsthelengthofthepulsereceivedontheexternaltimerpin.Astheenablebithasnowbeen reset,anyfurthertransitionsontheexternaltimerpinwillbeignored.Notuntiltheenablebitis againsethighbytheprogramcanthetimerbeginfurtherpulsewidthmeasurements.Inthisway, singleshotpulsemeasurementscanbeeasilymade. ItshouldbenotedthatinthismodetheTimer/EventCounteriscontrolledbylogicaltransitions ontheexternaltimerpinandnotbythelogiclevel.WhentheTimer/EventCounterisfulland overflows,aninterruptsignalisgeneratedandtheTimer/EventCounterwillreloadthevaluealready loadedintothepreloadregisterandcontinuecounting.Theinterruptcanbedisabledbyensuring thattheTimer/EventCounterInterruptEnablebitintheInterruptControlRegister,INTC0,isreset tozero. AstheexternaltimerpinissharedwithanI/Opin,toensurethatthepinisconfiguredtooperateas apulsewidthmeasurementpin,twothingshavetohappen.ThefirstistoensurethattheOperating ModeSelectbitsintheTimerControlRegisterplacetheTimer/EventCounterinthePulseWidth MeasurementMode,thesecondistoensurethattheportcontrolregisterconfiguresthepinasan input. |
Ähnliche Teilenummer - HT82B42R_14 |
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Ähnliche Beschreibung - HT82B42R_14 |
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