HT66F005 datasheet(56/109 Pages) HOLTEK

56 / 109 page

Rev. 1.30

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Rev. 1.30

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HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

HT66F005/HT66F006

Cost-Effective A/D Flash MCU with EEPROM

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,oneforeachoftheinternalcomparator

AorcomparatorP,whichgenerateaTMinterruptwhenacomparematchconditionoccurs.Whena

TMinterruptisgenerateditcanbeusedtoclearthecounterandalsotochangethestateoftheTM

outputpin.

TM External Pins

EachoftheTMshasoneTMinputpin,withthelabelTCKn.TheTMinputpin,isessentiallya

clocksourcefortheTMandisselectedusingtheTnCK2~TnCK0bitsintheTMnC0register.This

externalTMinputpinallowsanexternalclocksourcetodrivetheinternalTM.ThisexternalTM

inputpinissharedwithotherfunctionsbutwillbeconnectedtotheinternalTMifselectedusingthe

TnCK2~TnCK0bits.TheTMinputpincanbechosentohaveeitherarisingorfallingactiveedge.

TheTMseachhavetwooutputpinswiththelabelTPn_0andTPn_1.WhentheTMisinthe

CompareMatchOutputMode,thesepinscanbecontrolledbytheTMtoswitchtoahighorlow

levelortotogglewhenacomparematchsituationoccurs.TheexternalTPn_0andTPn_1output

pinsarealsothepinswheretheTMgeneratesthePWMoutputwaveform.AstheTPn_0andTPn_1

pinsarepin-sharedwithotherfunctions,theTPn_0orTPn_1pinfunctionisenabledordisabled

accordingtotheinternalTMon/offcontrol,operationmodeandoutputcontrolsettings.Whenthe

correspondingTMconfigurationselectstheTPn_0orTPn_1pintobeusedasanoutputpin,the

associatedpinwillbesetupasanexternalTMoutputpin.IftheTMconfigurationdeterminesthat

theTPn_0orTPn_1pinfunctionisnotused,theassociatedpinwillbecontrolledbyotherpin-

sharedfunctions.ThedetailsoftheTPn_0orTPn_1pinforeachTManddeviceareprovidedinthe

accompanyingtable.

Device

TM0

TM1

HT66F005/HT66F006

TP0_0� TP0_1

TP1_0� TP1_1

TM Output Pins

HT66F005 Datasheet(PDF) 56 Page - Holtek Semiconductor Inc

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