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HT66F302 Datasheet(PDF) 59 Page - Holtek Semiconductor Inc |
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HT66F302 Datasheet(HTML) 59 Page - Holtek Semiconductor Inc |
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59 / 129 page  Rev. 1.11 58 April 11, 2017 Rev. 1.11 59 April 11, 2017 HT66F302/HT66F303 Cost-Effective Flash MCU with EEPROM HT66F302/HT66F303 Cost-Effective Flash MCU with EEPROM Timer Modules – TM Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland measuretime.ToimplementtimerelatedfunctionsthedevicesincludeseveralTimerModules, abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo individualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare providedwithtimingunitswithawideandflexiblerangeoffeatures. ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation providedintheindividualStandardandPeriodicTMsections. Introduction ThedevicescontaintwoTMs.EachindividualTMcanbecategorisedasacertaintype,namely StandardTypeTMorPeriodicTypeTM.Althoughsimilarinnature,thedifferentTMtypesvaryin theirfeaturecomplexity.ThecommonfeaturestotheStandardandPeriodicTMswillbedescribed inthissectionandthedetailedoperationwillbedescribedincorrespondingsections.Themain featuresanddifferencesbetweenthetwotypesofTMsaresummarisedintheaccompanyingtable. Function STM PTM Timer/Counter √ √ I/P Capture √ √ Compare Match Output √ √ PWM Channels 1 1 Single Pulse Output 1 1 PWM Alignment Edge Edge PWM Adjustment Period & Duty Duty or Period Duty or Period TM Function Summary Device STM PTM HT66F302/HT66F303 10-bit STM 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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