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2.6.4.1One-ShotPulse
PSCLK
OSHT
EPWMxA in
EPWMxA out
Prog. pulse width
(OSHTWTH)
Start OSHT pulse
Sustaining pulses
PWM-Chopper(PC)Submodule
Thewidthofthefirstpulsecanbeprogrammedtoanyof16possiblepulsewidthvalues.Thewidthor
periodofthefirstpulseisgivenby:
T
1stpulse
=T
SYSCLKOUT
×8×OSHTWTH
WhereT
SYSCLKOUT
istheperiodofthesystemclock(SYSCLKOUT)andOSHTWTHisthefourcontrolbits
(valuefrom1to16)
Figure2-33showsthefirstandsubsequentsustainingpulsesandTable7.3givesthepossiblepulsewidth
valuesforaSYSCLKOUT=100MHz.
Figure2-33.PWM-ChopperSubmoduleWaveformsShowingtheFirstPulseandSubsequentSustaining
Pulses
Table2-16.PossiblePulseWidthValuesfor
SYSCLKOUT=100MHz
OSHTWTHzPulseWidth
(hex)(nS)
080
1160
2240
3320
4400
5480
6560
7640
8720
9800
A880
B960
C1040
D1120
E1200
F1280
SPRU791D–November2004–RevisedOctober2007ePWMSubmodules57
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