HT67F488 datasheet(62/171 Pages) HOLTEK

62 / 171 page

Rev. 1.60

6�

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HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput

aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshastwo

individualinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare

providedwithtimingunitswithawideandflexiblerangeoffeatures.

ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation

providedintheindividualCompactandPeriodicTMsections.

Introduction

ThesedevicescontainfourTMshavingareferencenameofTM0,TM1,TM2andTM3.Each

individualTMcanbecategorisedasacertaintype,namelyCompactTypeTMorPeriodicTypeTM.

Althoughsimilarinnature,thedifferentTMtypesvaryintheirfeaturecomplexity.Thecommon

featurestoalloftheCompactandPeriodicTMswillbedescribedinthissection,thedetailed

operationregardingeachoftheTMtypeswillbedescribedinseparatesections.Themainfeatures

anddifferencesbetweenthetwotypesofTMsaresummarisedintheaccompanyingtable.

Function

CTM

PTM

Ti�e�/Counte�

√

I/P Captu�e

—

√

Co�pa�e Match Output

√

PWM Channels

Single Pulse Output

—

PWM Align�ent

Edge

PWM Adjust�ent Pe�iod & Duty

Duty o� Pe�iod

TM Function Summary

ThischipcontainsaspecificnumberofeitherCompactTypeandPeriodicTypeTMunitswhichare

showninthetabletogetherwiththeirindividualreferencenames,TM0~TM3.

TM0

TM1

TM2

TM3

10-�it PTM

10-�it CTM

TM Name/Type Reference

TM Operation

ThetwodifferenttypesofTMofferadiverserangeoffunctions,fromsimpletimingoperations

toPWMsignalgeneration.ThekeytounderstandinghowtheTMoperatesistoseeitintermsof

afreerunningcounterwhosevalueisthencomparedwiththevalueofpre-programmedinternal

comparators.Whenthefreerunningcounterhasthesamevalueasthepre-programmedcomparator,

knownasacomparematchsituation,aTMinterruptsignalwillbegeneratedwhichcanclearthe

counterandperhapsalsochangetheconditionoftheTMoutputpin.TheinternalTMcounteris

drivenbyauserselectableclocksource,whichcanbeaninternalclockoranexternalpin.

HT67F488 Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

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