Thisapplicationnotediscussestheuseofthe
PIC16CXXXTimer1moduleasanasynchronousclock.
TheTimer1modulehasitownoscillatorcircuitry,which
allowsthetimertokeepreal-time,evenwhenthe
deviceisinSLEEPmode.Whenthedeviceisinsleep,
theoscillatorwillcontinuetoincrementTMR1.Anover-flowoftheTMR1registercausesaTMR1Overflow
Interrupt(ifenabled)andwillwaketheprocessorfrom
sleep.Theinterruptserviceroutinecanthenperform
thedesiredtask.
MUsingTimer1inAsynchronousClockModeAN580Inasynchronousoperation,iftheclocksourceisanAuthor:MarkPalmerexternalclock,itisinputontheT1CKIpin.IftheclockMicrochipTechnologyInc.sourceisacrystaloscillator,thecrystalisconnectedacrosstheT1OSOandT1OSIpins.INTRODUCTIONWhenusingTimer1inAsynchronousmode,theuseofThisapplicationnotediscussestheuse
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