HT68F005 datasheet(53/93 Pages) HOLTEK

53 / 93 page

Rev. 1.00

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Rev. 1.00

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HT68F005/HT68F006

Enhanced I/O Flash Type MCU

HT68F005/HT68F006

Enhanced I/O Flash Type MCU

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,CompareMatchOutputaswellasbeingthefunctionalunitfor

thegenerationofPWMsignals.EachoftheTMshastwoindividualinterrupts.Theadditionof

inputandoutputpinsforeachTMensuresthatusersareprovidedwithtimingunitswithawideand

flexiblerangeoffeatures.

Introduction

ThedevicescontaintwoTMswitheachTMhavingareferencenameofTM0andTM1.Each

individualTMcanbecategorisedasacertaintype,namelyCompactTypeTM,socalledCTM.The

mainfeaturesoftheTMsaresummarisedintheaccompanyingtable.

Function

CTM

Time�/Counte�

√

Compa�e Mat�h �utput

√

PWM Channels

PWM Alignment

Edge

PWM Adjustment Pe�iod & Duty

Duty o� Pe�iod

TM Function Summary

TM Operation

ThesetwoTMsofferarangeoffunctions,fromsimpletimingoperationstoPWMsignalgeneration.

ThekeytounderstandinghowtheTMoperatesistoseeitintermsofafreerunningcounterwhose

valueisthencomparedwiththevalueofpre-programmedinternalcomparators.Whenthefree

runningcounterhasthesamevalueasthepre-programmedcomparator,knownasacomparematch

situation,aTMinterruptsignalwillbegeneratedwhichcanclearthecounterandperhapsalso

changetheconditionoftheTMoutputpin.TheinternalTMcounterisdrivenbyauserselectable

clocksource,whichcanbeaninternalclockoranexternalpin.

TM Clock Source

TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources.The

selectionoftherequiredclocksourceisimplementedusingtheTnCK2~TnCK0bitsintheTMcontrol

registers.TheclocksourcecanbearatioofeitherthesystemclockfSYSortheinternalhighclockfH,

thefLIRCclocksourceortheexternalTCKnpin.Notethatsettingthesebitstothevalue101willselect

areservedclockinput,ineffectdisconnectingtheTMclocksource.TheTCKnpinclocksourceis

usedtoallowanexternalsignaltodrivetheTMasanexternalclocksourceorforeventcounting.

TM Interrupts

TheCompacttypeTMseachhavetwointernalinterrupts,oneforeachoftheinternalcomparatorA

orcomparatorP,whichgenerateaTMinterruptwhenacomparematchconditionoccurs.Whena

TMinterruptisgenerateditcanbeusedtoclearthecounterandalsotochangethestateoftheTM

outputpin.

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