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HT45F5R Datasheet(PDF) 61 Page - Holtek Semiconductor Inc |
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HT45F5R Datasheet(HTML) 61 Page - Holtek Semiconductor Inc |
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61 / 138 page  Rev. 1.10 �0 De�e��e� 1�� �01� Rev. 1.10 �1 De�e��e� 1�� �01� HT45F5R Charger ASSP Flash MCU HT45F5R Charger ASSP Flash MCU Timer Module – TM Oneofthemostfundamentalfunctionsinanymicrocontrollerdevicesistheabilitytocontroland measuretime.ToimplementtimerelatedfunctionsthedeviceincludesseveralTimerModules, generallyabbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo interrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersareprovidedwith timingunitswithawideandflexiblerangeoffeatures. ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation providedintheindividualStandardandPeriodicTMsections. Introduction ThedevicecontainsaStandardTypeTMandtwoPeriodicTypeTMswhichhaveareferencename ofSTM,PTM0andPTM1.Althoughsimilarinnature,thedifferentTMtypesvaryintheirfeature complexity.ThecommonfeaturestoalloftheStandardandPeriodicTMswillbedescribedinthis sectionandthedetailedoperationregardingeachoftheTMtypeswillbedescribedinseparate sections.ThemainfeaturesanddifferencesbetweenthetwotypesofTMsaresummarisedinthe accompanyingtable. TM Function STM PTM Ti�e�/Counte� √ √ Input Captu�e √ √ Co�pa�e Mat�h Output √ √ PWM Channels 1 1 Single Pulse Output 1 1 PWM Align�ent Edge Edge PWM Adjust�ent Pe�iod & Duty Duty o� Pe�iod Duty o� Pe�iod TM Function Summary TM Operation ThedifferenttypesofTMofferadiverserangeoffunctions,fromsimpletimingoperationstoPWM signalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsofafree runningcount-upcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal comparators.Whenthefreerunningcount-upcounterhasthesamevalueasthepre-programmed comparator,knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhich canclearthecounterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTM counterisdrivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin. TM Clock Source TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources.The selectionoftherequiredclocksourceisimplementedusingthexTnCK2~xTnCK0bitsinthexTMn controlregisters,where"x"standsforSorPtypeTMand"n"standsforthespecificTMserial number.ForPTM,thereisaserialnumber"n"intherelevantpinorcontrolbitssincetherearetwo PTMinthedevice.Theclocksourcecanbearatioofthesystemclock,fSYS,ortheinternalhigh clock,fH,thefSUBclocksourceortheexternalxTCKnpin.ThexTCKnpinclocksourceisusedto allowanexternalsignaltodrivetheTMasanexternalclocksourceforeventcounting. |
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