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HT45R4U датащи(PDF) 44 Page - Holtek Semiconductor Inc |
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HT45R4U датащи(HTML) 44 Page - Holtek Semiconductor Inc |
44 / 105 page Rev. 1.10 44 �a��� 1�� �01� Rev. 1.10 4� �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD IftheActiveEdgeSelectbitTnEG,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,whichcannowbereadbytheprogram,therefore representsthelengthofthepulsereceivedontheexternaltimerpin.Astheenablebithasnowbeen reset,anyfurthertransitionsontheexternaltimerpinwillbeignored.Notuntiltheenablebitis againsethighbytheprogramcanthetimerbeginfurtherpulsewidthmeasurements.Inthisway, singleshotpulsemeasurementscanbeeasilyMade. ItshouldbenotedthatinthismodetheTimer/EventCounteriscontrolledbylogicaltransitions ontheexternaltimerpinandnotbythelogiclevel.WhentheTimer/EventCounterisfulland overflows,aninterruptsignalisgeneratedandtheTimer/EventCounterwillreloadthevaluealready loadedintothepreloadregisterandcontinuecounting.Theinterruptcanbedisabledbyensuring thattheTimer/EventCounterInterruptEnablebitinthecorrespondingInterruptControlRegister,is resettozero. AstheexternaltimerpinissharedwithanI/Opin,toensurethatthepinisconfiguredtooperateas apulsewidthmeasurementpin,twothingshavetohappen.ThefirstistoensurethattheOperating ModeSelectbitsintheTimerControlRegisterplacetheTimer/EventCounterinthePulseWidth MeasurementMode,thesecondistoensurethattheportcontrolregisterconfiguresthepinasan input. +1 +2 +3 +4 Ti me r Ex te rn al T MR Pi n I npu t Tn ON - w it h Tn EG =0 Pr es ca le r Ou t put In cr em en t Ti me r C oun te r Pr es ca le r Ou t p ut i s s am p le d at e ve r y fa lli n g e d g e of T 1. Pulse Width Capture Mode Timing Chart |
Аналогичный номер детали - HT45R4U |
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Аналогичное описание - HT45R4U |
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