Enhanced PWM (ePWM) Module
15.2.4.3.1 Action-Qualifier Output A Control Register (AQCTLA)
The action-qualifier output A control register (AQCTLA) is shown in
and described in
.
Figure 15-78. Action-Qualifier Output A Control Register (AQCTLA)
15
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
CBD
CBU
CAD
CAU
PRD
ZRO
R-0
R/W-0
R/W-0
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 15-70. Action-Qualifier Output A Control Register (AQCTLA) Field Descriptions
Bits
Name
Value
Description
15-12
Reserved
0
Reserved
11-10
CBD
0-3h
Action when the time-base counter equals the active CMPB register and the counter is decrementing.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
9-8
CBU
0-3h
Action when the counter equals the active CMPB register and the counter is incrementing.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
7-6
CAD
0-3h
Action when the counter equals the active CMPA register and the counter is decrementing.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
5-4
CAU
0-3h
Action when the counter equals the active CMPA register and the counter is incrementing.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
3-2
PRD
0-3h
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.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
1-0
ZRO
0-3h
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.
0
Do nothing (action disabled)
1h
Clear: force EPWMxA output low.
2h
Set: force EPWMxA output high.
3h
Toggle EPWMxA output: low output signal will be forced high, and a high signal will be forced low.
1590
Pulse-Width Modulation Subsystem (PWMSS)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated