HT46R0042 datasheet(39/83 Pages) HOLTEK

39 / 83 page

Rev. 1.00

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Rev. 1.00

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HT46R0042

Cost-Effective A/D 8-Bit OTP MCU

HT46R0042

Cost-Effective A/D 8-Bit OTP MCU

In cr em en t

Ti me r C ont ro ll er

Pr e sca le r Ou t put

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Timer Mode Timing Chart

Event Counter Mode

Inthismode,anumberofexternallychanginglogicevents,occurringontheexternaltimerTMR

pin,canberecordedbytheTimer/EventCounter.Tooperateinthismode,theOperatingMode

Selectbitpair,TM1/TM0,intheTimerControlRegistermustbesettothecorrectvalueasshown.

Bit7

Bit6

Control Register Operating Mode Select Bits for the Timer Mode.

Inthismode,theexternaltimerTMRpin,isusedastheTimer/EventCounterclocksource,however

itisnotdividedbytheinternalprescaler.AftertheotherbitsintheTimerControlRegisterhavebeen

set,theenablebitTON,whichisbit4oftheTimerControlRegister,canbesethightoenablethe

Timer/EventCountertorun.IftheActiveEdgeSelectbit,TEG,whichisbit3oftheTimerControl

lowtohightransition.IftheTEGishigh,thecounterwillincrementeachtimetheexternaltimerpin

receivesahightolowtransition.Whenitisfullandoverflows,aninterruptsignalisgeneratedand

theTimer/EventCounterwillreloadthevaluealreadyloadedintothepreloadregisterandcontinue

counting.TheinterruptcanbedisabledbyensuringthattheTimer/EventCounterInterruptEnable

bitinthecorrespondingInterruptControlRegister.Itisresettozero.

AstheexternaltimerpinissharedwithanI/Opin,toensurethatthepinisconfiguredtooperateas

aneventcounterinputpin,twothingshavetohappen.ThefirstistoensurethattheOperatingMode

SelectbitsintheTimerControlRegisterplacetheTimer/EventCounterintheEventCounting

Mode.Thesecondistoensurethattheportcontrolregisterconfiguresthepinasaninput.Itshould

benotedthatintheeventcountingmode,evenifthemicrocontrollerisintheSleepMode,the

Timer/EventCounterwillcontinuetorecordexternallychanginglogiceventsonthetimerinput

TMRpin.Asaresultwhenthetimeroverflowsitwillgenerateatimerinterruptandcorresponding

wake-upsource.

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Event Counter Mode Timing Chart (TEG=1)

HT46R0042 Datasheet(PDF) 39 Page - Holtek Semiconductor Inc

HT46R0042 Datasheet(HTML) 39 Page - Holtek Semiconductor Inc

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