HT45F3W datasheet(76/167 Pages) HOLTEK

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Rev. 1.50

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HT45F3W

R-Type Blood Pressure Meter Flash MCU

HT45F3W

R-Type Blood Pressure Meter Flash MCU

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput

aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshaseither

twoorthreeindividualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthat

usersareprovidedwithtimingunitswithawideandflexiblerangeoffeatures.

ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation

providedintheindividualCompactandStandardTMsections.

Introduction

ThedevicecontainsfromthreeTMshavingareferencenameofTM0,TM1,andTM2.Each

individualTMcanbecategorisedasacertaintype,namelyCompactTypeTMorStandardType

TM.Althoughsimilarinnature,thedifferentTMtypesvaryintheirfeaturecomplexity.The

commonfeaturestoalloftheCompactandStandardTMswillbedescribedinthissection,the

detailedoperationregardingeachoftheTMtypeswillbedescribedinseparatesections.Themain

featuresanddifferencesbetweenthetwotypesofTMsaresummarisedintheaccompanyingtable.

Function

CTM

STM

Ti�e�/Counte�

√

I/P Captu�e

—

√

Co�pa�e Mat�h Output

—

√

PWM Channels

Single Pulse Output

—

PWM Align�ent

Edge

PWM Adjust�ent Pe�iod & Duty

Duty o� Pe�iod

ThischipcontainsaspecificnumberofeitherCompactTypeandStandardTypeTMunitswhichare

showninthetabletogetherwiththeirindividualreferencenames,TM0~TM2.

Device

TM0

TM1

TM2

HT45F3W

10-�it CTM

1�-�it STM

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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