PSCLK
OSHT
EPWMxA in
EPWMxA out
Prog. pulse width
(OSHTWTH)
Start OSHT pulse
Sustaining pulses
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ePWM Submodules
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SPNU563A–March 2018
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Enhanced Pulse Width Modulator (ePWM) Module
35.2.6.4.1 One-Shot Pulse
The width of the first pulse can be programmed to any of 16 possible pulse width values. The width or
period of the first pulse is given by:
T
1stpulse
= T
VCLK3
× 8 × OSHTWTH
Where T
VCLK3
is the period of the system clock (VCLK3) and OSHTWTH is the four control bits (value from
1 to 16)
Figure 35-33 shows the first and subsequent sustaining pulses and Table 35-17 gives the possible pulse
width values for a VCLK3 = 100 MHz.
Figure 35-33. PWM-Chopper Submodule Waveforms Showing the First Pulse and Subsequent Sustaining
Pulses
Table 35-17. Possible Pulse Width Values for VCLK3 = 100 MHz
OSHTWTHz
(hex)
Pulse Width
(nS)
0 100
1 200
2 300
3 400
4 500
5 600
6 700
7 800
8 900
9 1000
A 1100
B 1200
C 1300
D 1400
E 1500
F 1600
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