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ePWM Submodules
•
Clear Low:
Set output EPWMxA or EPWMxB to a low level.
•
Toggle:
If EPWMxA or EPWMxB is currently pulled high, then pull the output low. If EPWMxA or EPWMxB is
currently pulled low, then pull the output high.
•
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 7.2.8
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
7-20. 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 7-20. Possible Action-Qualifier Actions for EPWMxA and EPWMxB Outputs
S/W
force
SW
SW
SW
SW
T
700
C28 Enhanced Pulse Width Modulator (ePWM) Module
TB Counter equals:
Comp
Zero
A
Z
CA
Z
CA
Z
CA
Z
CA
T
T
Copyright © 2012–2019, Texas Instruments Incorporated
Comp
Period
B
CB
P
CB
P
CB
P
CB
P
T
T
SPRUHE8E – October 2012 – Revised November 2019
www.ti.com
Actions
Do Nothing
Clear Low
Set High
Toggle
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