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HT45R2K-C Datenblatt(PDF) 51 Page - Holtek Semiconductor Inc |
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HT45R2K-C Datenblatt(HTML) 51 Page - Holtek Semiconductor Inc |
51 / 105 page Rev. 1.40 �0 �a��� 1�� �01� Rev. 1.40 �1 �a��� 1�� �01� HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale HT45R2K-C/-B/-A Dual Slope 16K/8K/4K ASSP MCU for Body Fat Scale Mode,thesecondistoensurethattheportcontrolregisterconfiguresthepinasaninput.Itshould benotedthatintheeventcountingmode,eveniftheisinthePowerDownMode,theTimer/Event CounterwillcontinuetorecordexternallychanginglogiceventsonthetimerinputTMRnpin.Asa resultwhenthetimeroverflowsitwillgenerateatimerinterruptandcorrespondingwake-upsource. Ex te rm al E v ent In cr em en t Ti me r Co nt ro ll er Ti me r+ 1T im er +2 Ti me r+ 3 Event Counter Mode Timing Chart (TnE=1) Pulse Width Measurement Mode Inthismode,theTimer/EventCountercanbeutilisedtomeasurethewidthofexternalpulses appliedtotheexternaltimerpin.Tooperateinthismode,theOperatingModeSelectbitpair,TnM1/ TnM0,intheTimerControlRegistermustbesettothecorrectvalueasshown. ControlRegisterOperatingModeSelectBitsforthePulseWidthCaptureMode Bit7 Bit6 1 1 Inthismodetheinternalclock,fSYS,fSYS/4,fLorfTCK,isusedastheinternalclockforthe8-bit Timer/EventCounterandthe16-bitTimer/EventCounter.However,theclocksource,fSYSand fSYS/4,forthe8-bittimerandthe16-bittimerarefurtherdividedbyaprescaler,thevalueofwhich isdeterminedbythePrescalerRateSelectbitsTnPSC2~TnPSC0,whicharebits2~0intheTimer ControlRegister.AftertheotherbitsintheTimerControlRegisterhavebeensetup,theenable bitTnON,whichisbit4oftheTimerControlRegister,canbesethightoenabletheTimer/Event Counter,howeveritwillnotactuallystartcountinguntilanactiveedgeisreceivedontheexternal timerpin. IftheActiveEdgeSelectbitTnE,whichisbit3oftheTimerControlRegister,islow,onceahigh tolowtransitionhasbeenreceivedontheexternaltimerpin,theTimer/EventCounterwillstart countinguntiltheexternaltimerpinreturnstoitsoriginalhighlevel.Atthispointtheenablebitwill beautomaticallyresettozeroandtheTimer/EventCounterwillstopcounting.IftheActiveEdge Selectbitishigh,theTimer/EventCounterwillbegincountingoncealowtohightransitionhas beenreceivedontheexternaltimerpinandstopcountingwhentheexternaltimerpinreturnstoits originallowlevel.Asbefore,theenablebitwillbeautomaticallyresettozeroandtheTimer/Event Counterwillstopcounting.ItisimportanttonotethatinthepulsewidthmeasurementMode,the enablebitisautomaticallyresettozerowhentheexternalcontrolsignalontheexternaltimerpin returnstoitsoriginallevel,whereasintheothertwomodestheenablebitcanonlyberesettozero underprogramcontrol.TheresidualvalueintheTimer/EventCounter,whichcannowbereadby theprogram,thereforerepresentsthelengthofthepulsereceivedontheTMRnpin.Astheenable bithasnowbeenreset,anyfurthertransitionsontheexternaltimerpinwillbeignored.Thetimer cannotbeginfurtherpulsewidthmeasurementuntiltheenablebitissethighagainbytheprogram. Inthisway,singleshotpulsemeasurementscanbeeasilymade. ItshouldbenotedthatinthismodetheTimer/EventCounteriscontrolledbylogicaltransitions ontheexternaltimerpinandnotbythelogiclevel.WhentheTimer/EventCounterisfulland overflows,aninterruptsignalisgeneratedandtheTimer/EventCounterwillreloadthevaluealready loadedintothepreloadregisterandcontinuecounting.Theinterruptcanbedisabledbyensuring thattheTimer/EventCounterInterruptEnablebitinthecorrespondingInterruptControlRegister,is resettozero. |
Ähnliche Teilenummer - HT45R2K-C_15 |
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Ähnliche Beschreibung - HT45R2K-C_15 |
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