HT45FM2C datasheet(60/171 Pages) HOLTEK

60 / 171 page

Rev. 1.10

�a� �0� �01�

Rev. 1.10

�a� �0� �01�

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Preliminar�

Timer Modules – TM

Oneofthemostfundamentalfunctionsinanymicrocontrollerdeviceistheabilitytocontroland

measuretime.ToimplementtimerelatedfunctionseachdeviceincludesseveralTimerModules,

abbreviatedtothenameTM.TheTMsaremulti-purposetimingunitsandservetoprovide

operationssuchasTimer/Counter,InputCapture,CompareMatchOutputandSinglePulseOutput

aswellasbeingthefunctionalunitforthegenerationofPWMsignals.EachoftheTMshas

eithermultipleinterrupts.TheadditionofinputandoutputpinsforeachTMensuresthatusersare

providedwithtimingunitswithawideandflexiblerangeoffeatures.

ThecommonfeaturesofthedifferentTMtypesaredescribedherewithmoredetailedinformation

providedintheindividualCompactandStandardTMsections.

Introduction

ThedevicecontainsfiveTMshavingareferencenameofTM0,TM1,TM2,TM3andTM5.Each

individualTMcanbecategorisedasacertaintype,namelyCompactTypeTM,four10-bitCTMand

one16-bitCTM.Themainfeaturesaresummarisedintheaccompanyingtable.

Function

CTM

Timer/Counter

√

I/P Capture

—

Compare �atch Output

√

PW� Channels

Single Pulse Output

—

PW� Alignment

Edge

PW� Adjustment Period & Dut�

Dut� or Period

TM Function Summary

TM Operation

TMofferadiverserangeoffunctions,fromsimpletimingoperationstoPWMsignalgeneration.

ThekeytounderstandinghowtheTMoperatesistoseeitintermsofafreerunningcounterwhose

valueisthencomparedwiththevalueofpre-programmedinternalcomparators.Whenthefree

runningcounterhasthesamevalueasthepre-programmedcomparator,knownasacomparematch

situation,aTMinterruptsignalwillbegeneratedwhichcanclearthecounterandperhapsalso

changetheconditionoftheTMoutputpin.TheinternalTMcounterisdrivenbyauserselectable

clocksource,whichcanbeaninternalclockoranexternalpin.

TM Clock Source

TheclocksourcewhichdrivesthemaincounterineachTMcanoriginatefromvarioussources.

TheselectionoftherequiredclocksourceisimplementedusingtheTnCK2~TnCK0bitsintheTM

controlregisters.TheclocksourcecanbearatioofeitherthesystemclockfSYSortheinternalhigh

clockfH,thefTBCclocksourceortheexternalTCKnpin.Notethatsettingthesebitstothevalue101

willselectanundefinedclockinput,ineffectdisconnectingtheTMclocksource.TheTCKnpin

clocksourceisusedtoallowanexternalsignaltodrivetheTMasanexternalclocksourceorfor

eventcounting.

TM Interrupts

TheCompacttypeTMhastwointernalinterrupts,oneforeachoftheinternalcomparatorAor

comparatorP,whichgenerateaTMinterruptwhenacomparematchconditionoccurs.

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