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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HT45F77 데이터시트(PDF) 74 Page - Holtek Semiconductor Inc |
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HT45F77 데이터시트(HTML) 74 Page - Holtek Semiconductor Inc |
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74 / 203 page  Rev. 1.20 7� De�e��e� 1�� 201� Rev. 1.20 75 De�e��e� 1�� 201� HT45F77 Body Fat Scale Flash MCU HT45F77 Body Fat Scale Flash MCU Timer Modules – TM Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules, abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo individualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare providedwithtimingunitswithawideandflexiblerangeoffeatures. ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation providedintheindividualCompactandPeriodicTMsections. Introduction ThedevicecontainsthreeTMshavingareferencenameofTM0,TM1andTM2.Eachindividual TMcanbecategorisedasacertaintype,namelyCompactTypeTMorPeriodicTypeTM.Although similarinnature,thedifferentTMtypesvaryintheirfeaturecomplexity.Thecommonfeaturestoall oftheCompactandPeriodicTMswillbedescribedinthissection,thedetailedoperationregarding eachoftheTMtypeswillbedescribedinseparatesections.Themainfeaturesanddifferences betweenthetwotypesofTMsaresummarisedintheaccompanyingtable. Function CTM PTM Ti�e�/Counte� √ √ I/P Captu�e — √ Co�pa�e Mat�h Output √ √ PWM Channels 1 1 Single Pulse Output — 1 PWM Align�ent Edge Edge PWM Adjust�ent Pe�iod & Duty Duty o� Pe�iod Duty o� Pe�iod TM Function Summary TM0 TM1 TM2 10-�it CTM 10-�it PTM 10-�it PTM TM Name/Type Reference TM Operation ThetwodifferenttypesofTMofferadiverserangeoffunctions,fromsimpletimingoperations toPWMsignalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsof afreerunningcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal comparators.Whenthefreerunningcounterhasthesamevalueasthepre-programmedcomparator, knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe counterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTMcounteris drivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin. TM Clock Source TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources. TheselectionoftherequiredclocksourceisimplementedusingtheTnCK2~TnCK0bitsintheTM controlregisters.TheclocksourcecanbearatioofeitherthesystemclockfSYSortheinternalhigh clockfH,thefSUBclocksourceortheexternalTCKnpin.TheTCKnpinclocksourceisusedtoallow anexternalsignaltodrivetheTMasanexternalclocksourceorforeventcounting. |
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