Z
Z
Z
CA
CA
CA
Z
T
CB
T
P
T
CA
T
CB P
CB
CB P
Do Nothing
Clear Low
Set High
Toggle
P
Zero
Comp
A
Comp
B
Period
TB Counter equals:
Actions
S/W
force
SW
SW
SW
SW
T
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ePWM Submodules
2017
SPNU563A–March 2018
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Enhanced Pulse Width Modulator (ePWM) Module
• Do Nothing:
Keep outputs EPWMxA and EPWMxB at same level as currently set. Although the "Do Nothing" option
prevents an event from causing an action on the EPWMxA and EPWMxB outputs, this event can still
trigger interrupts and ADC start of conversion. See the Event-trigger Submodule description in
Section 35.2.8 for details.
Actions are specified independently for either output (EPWMxA or EPWMxB). Any or all events can be
configured to generate actions on a given output. For example, both CTR = CMPA and CTR = CMPB can
operate on output EPWMxA. All qualifier actions are configured via the control registers found at the end
of this section.
For clarity, the drawings in this document use a set of symbolic actions. These symbols are summarized in
Figure 35-19. Each symbol represents an action as a marker in time. Some actions are fixed in time (zero
and period) while the CMPA and CMPB actions are moveable and their time positions are programmed
via the counter-compare A and B registers, respectively. To turn off or disable an action, use the "Do
Nothing option"; it is the default at reset.
Figure 35-19. Possible Action-Qualifier Actions for EPWMxA and EPWMxB Outputs
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