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HT66F0187 Datasheet(PDF) 67 Page - Holtek Semiconductor Inc |
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HT66F0187 Datasheet(HTML) 67 Page - Holtek Semiconductor Inc |
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67 / 192 page  Rev. 1.20 66 ����st 2�� 201� Rev. 1.20 6� ����st 2�� 201� HT66F0187 A/D Flash MCU with EEPROM HT66F0187 A/D Flash MCU with EEPROM Timer Modules – TM Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules, abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo individualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare providedwithtimingunitswithawideandflexiblerangeoffeatures. ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation providedintheindividualStandardandPeriodicTMsections. Introduction ThedevicecontainsthreeTMsandeachindividualTMcanbecategorisedasacertaintype,namely StandardTypeTMorPeriodicTypeTM.Althoughsimilarinnature,thedifferentTMtypesvaryin theirfeaturecomplexity.ThecommonfeaturestotheStandardandPeriodicTMswillbedescribed inthissectionandthedetailedoperationregardingeachoftheTMtypeswillbedescribedin separatesections.ThemainfeaturesanddifferencesbetweenthetwotypesofTMsaresummarised intheaccompanyingtable. Function STM PTM Timer/Co�nter √ √ I/P Capt�re √ √ Compare Match O�tp�t √ √ PWM Channels 1 1 Sin�le P�lse O�tp�t 1 1 PWM �li�nment Ed�e Ed�e PWM �dj�stment Period & D�ty D�ty or Period D�ty or Period STM PTM 16-bit STM0 16-bit STM1 10-bit PTM TM Name/Type Reference TM Operation ThetwodifferenttypesofTMofferadiverserangeoffunctions,fromsimpletimingoperations toPWMsignalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsof afreerunningcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal comparators.Whenthefreerunningcounterhasthesamevalueasthepre-programmedcomparator, knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe counterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTMcounteris drivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin. |
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