Registers
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SPRUI07–March 2020
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Enhanced Pulse Width Modulator (ePWM) Module
3.4.3 Action-Qualifier Submodule Registers
Figure 3-70 through Figure 3-73 and Table 3-30 through Table 3-33 provide the action-qualifier submodule
register definitions.
Figure 3-70. Action-Qualifier Output A Control Register (AQCTLA)
15 12 11 10 9 8
Reserved CBD CBU
R-0 R/W-0 R/W-0
7 6 5 4 3 2 1 0
CAD CAU PRD ZRO
R/W-0 R/W-0 R/W-0 R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 3-30. Action-Qualifier Output A Control Register (AQCTLA) Field Descriptions
Bits Name Value Description
15-12 Reserved Reserved
11-10 CBD Action when the time-base counter equals the active CMPB register and the counter is decrementing.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
9-8 CBU Action when the counter equals the active CMPB register and the counter is incrementing.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
7-6 CAD Action when the counter equals the active CMPA register and the counter is decrementing.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
5-4 CAU Action when the counter equals the active CMPA register and the counter is incrementing.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
3-2 PRD Action when the counter equals the period.
Note: By definition, in count up-down mode when the counter equals period the direction is defined as 0 or
counting down.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
1-0 ZRO Action when counter equals zero.
Note: By definition, in count up-down mode when the counter equals 0 the direction is defined as 1 or
counting up.
00 Do nothing (action disabled)
01 Clear: force EPWMxA output low.
10 Set: force EPWMxA output high.
11 Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
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