CTR = CMPB
CTR = CMPA
CTR_Dir
CTR = 0
CTR = PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxA
EPWMxB
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxA
EPWMxB
TZ1
to TZn
CTR = CMPA
Time-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
Interrupt
controller
Interrupt
controller
Architecture
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Enhanced High-Resolution Pulse-Width Modulator (eHRPWM)
14.2.5 Action-Qualifier (AQ) Submodule
Figure 14-18 shows the action-qualifier (AQ) submodule (see shaded block) in the ePWM system. The
action-qualifier submodule has the most important role in waveform construction and PWM generation. It
decides which events are converted into various action types, thereby producing the required switched
waveforms at the EPWMxA and EPWMxB outputs.
Figure 14-18. Action-Qualifier Submodule
14.2.5.1 Purpose of the Action-Qualifier Submodule
The action-qualifier submodule is responsible for the following:
• Qualifying and generating actions (set, clear, toggle) based on the following events:
– CTR = PRD: Time-base counter equal to the period (TBCNT = TBPRD)
– CTR = 0: Time-base counter equal to zero (TBCNT = 0000h)
– CTR = CMPA: Time-base counter equal to the counter-compare A register (TBCNT = CMPA)
– CTR = CMPB: Time-base counter equal to the counter-compare B register (TBCNT = CMPB)
• Managing priority when these events occur concurrently
• Providing independent control of events when the time-base counter is increasing and when it is
decreasing.
14.2.5.2 Controlling and Monitoring the Action-Qualifier Submodule
Table 14-7 lists the registers used to control and monitor the action-qualifier submodule.
Table 14-7. Action-Qualifier Submodule Registers
Acronym Register Description Address Offset Shadowed
AQCTLA Action-Qualifier Control Register For Output A (EPWMxA) 16h No
AQCTLB Action-Qualifier Control Register For Output B (EPWMxB) 18h No
AQSFRC Action-Qualifier Software Force Register 1Ah No
AQCSFRC Action-Qualifier Continuous Software Force 1Ch Yes
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