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2.4 Action-Qualifier (AQ) Submodule
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
EPWMxSOCA
EPWMxSOCB
EPWMxA
EPWMxB
TZ1
to TZ6
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
ADC
PIE
PIE
2.4.1 Purpose of the Action-Qualifier Submodule
2.4.2 Action-Qualifier Submodule Control and Status Register Definitions
Action-Qualifier (AQ) Submodule
Figure 2-17 shows the action-qualifier (AQ) submodule (see shaded block) in the ePWM system.
Figure 2-17. Action-Qualifier Submodule
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.
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 (TBCTR = TBPRD).
– CTR = Zero: Time-base counter equal to zero (TBCTR = 0x0000)
– CTR = CMPA: Time-base counter equal to the counter-compare A register (TBCTR = CMPA)
– CTR = CMPB: Time-base counter equal to the counter-compare B register (TBCTR = 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. .
The action-qualifier submodule operation is controlled and monitored via the registers in Table 2-6 .
Table 2-6. Action-Qualifier Submodule Registers
Register Address offset Shadowed Description
Name
AQCTLA 0x000B No Action-Qualifier Control Register For Output A (EPWMxA)
AQCTLB 0x000C No Action-Qualifier Control Register For Output B (EPWMxB)
AQSFRC 0x000D No Action-Qualifier Software Force Register
AQCSFRC 0x000E Yes Action-Qualifier Continuous Software Force
SPRU791D – November 2004 – Revised October 2007 ePWM Submodules 37
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