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5.15Timer
5.15.1TimerElectricalData/Timing
1
2
4
4
3
TIM_IN
TMS320DM355
DigitalMediaSystem-on-Chip(DMSoC)
SPRS463A–SEPTEMBER2007–REVISEDSEPTEMBER2007
Thecontainsfoursoftware-programmabletimers.Timer0,Timer1,andTimer3(general-purposetimers)
canbeprogrammedin64-bitmode,dual32-bitunchainedmode,ordual32-bitchainedmode.Timer3
supportsadditionalfeaturesovertheothertimers:externalclock/eventinput,periodreload,outputevent
tiedtoRealTimeOut(RTO)module,externaleventcapture,andtimercounterregisterreadreset.Timer
2isusedonlyasawatchdogtimer.Timer2istiedtodevicereset.
•64-bitcount-upcounter
•Timermodes:
–64-bitgeneral-purposetimermode(Timer0,1,3)
–Dual32-bitgeneral-purposetimermode(Timer0,1,3)
–Watchdogtimermode(Timer2)
•Twopossibleclocksources:
–Internalclock
–Externalclock/eventinputviatimerinputpins(Timer3)
•Threepossibleoperationmodes:
–One-timeoperation(timerrunsforoneperiodthenstops)
–Continuousoperation(timerautomaticallyresetsaftereachperiod)
–Continuousoperationwithperiodreload(Timer3)
•GeneratesinterruptstotheARMCPU
•GeneratessynceventtoEDMA
•Generatesoutputeventtodevicereset(Timer2)
•GeneratesoutputeventtoRealTimerOut(RTO)module(Timer3)
•Externaleventcaptureviatimerinputpins(Timer3)
Formoredetailedinformation,seetheTMS320DM355DMSoC64-bitTimerUser'sGuideformore
information(SPRUEE5).
Table5-45.TimingRequirementsforTimerInput
(1)(2)(3)
(seeFigure5-46)
DM355
NO.UNIT
MINMAX
1t
c(TIN)
Cycletime,TIM_IN4Pns
2t
w(TINPH)
Pulseduration,TIM_INhigh0.45C0.55Cns
3t
w(TINPL)
Pulseduration,TIM_INlow0.45C0.55Cns
4t
t(TIN)
Transitiontime,TIM_IN0.05Cns
(1)GPIO000,GPIO001,GPIO002,andGPIO003canbeusedasexternalclockinputsforTimer3.SeetheTMS320DM355DMSoC64-bit
TimerUser'sGuideformoreinformation(SPRUEE5).
(2)P=MXI1/CLKINcycletimeinns.Forexample,whenMXI1/CLKINfrequencyis24MHzuseP=41.6ns.
(3)C=TIM_INcycletimeinns.Forexample,whenTIM_INfrequencyis24MHzuseC=41.6ns
Figure5-46.TimerInputTiming
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