ETIC 2230 Podręcznik Użytkownika Pobierz pdf (Strona 58)

Rev. 1.10 58 November 14, 2014 Rev. 1.10 59 November 14, 2014

HT66FW2230

Wireless Charger A/D Flash 8-Bit MCU

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionsthedeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput

aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo

individualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare

providedwithtimingunitswithawideandexiblerangeoffeatures.

ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation

providedintheindividualStandardandCompactTMsection.

Introduction

Thedevicecontainsa10-bitStandardTManda10-bitCompactTM,eachTMhavingareference

nameofTM0andTM1.Althoughsimilarinnature,thedifferentTMtypesvaryintheirfeature

complexity.ThecommonfeaturestotheStandardandCompactTMswillbedescribedinthis

sectionandthedetailedoperationwillbedescribedincorrespondingsections.Themainfeatures

anddifferencesbetweenthetwotypesofTMsaresummarisedintheaccompanyingtable.

Function STM CTM

Timer/Counter √ √

I/P Capture √ —

Compare Match Output √ √

PWM Channels 1 1

Single Pulse Output 1 —

PWM Alignment Edge Edge

PWM Adjustment Period & Duty Duty or Period Duty or Period

TM Function Summary

TM0 TM1

10-bit STM 10-bit CTM

TM Name/Type Reference

TM Operation

ThetwodifferenttypesofTMsofferadiverserangeoffunctions,fromsimpletimingoperations

toPWMsignalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsof

afreerunningcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal

comparators.Whenthefreerunningcounterhasthesamevalueasthepre-programmedcomparator,

knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe

counterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTMcounteris

drivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin.

TM Clock Source

TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources.

TheselectionoftherequiredclocksourceisimplementedusingtheTnCK2~TnCK0bitsintheTM

controlregisters.Theclocksourcecanbearatioofeitherthesystemclockf

SYS

ortheinternalhigh

clockf

,thef

SUB

clocksourceortheexternalTCKnpin.TheTCKnpinclocksourceisusedtoallow

anexternalsignaltodrivetheTMasanexternalclocksourceorforeventcounting.

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