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Digital Compare

Signals

Counter Compare

Signals

T ime Base

Signals

Dead

Band

(DB)

Counter

Compare

(CC)

Action

Qualifier

(AQ)

EPWMxA

EPWMxB

CTR = CMPB

CTR = 0

EPWMxINT

EPWMxSOCA

EPWMxSOCB

EPWMxA

EPWMxB

nTZ1 to nTZ3

CTR = CMPA

T ime-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

VIM

Digital

Compare

(DC)

CPU Debug Mode

OSCFAIL or PLL SLip

Combination of EQEP1ERR

and EQEP2ERR

Digital Compare

Signals

Digital Compare

Signals

VIM

ePWM Submodules

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34.2.4 Action-Qualifier (AQ) Submodule

Figure 34-17 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 34-17. Action-Qualifier Submodule

34.2.4.1 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 (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.

34.2.4.2 Action-Qualifier Submodule Control and Status Register Definitions

The action-qualifier submodule operation is controlled and monitored via the registers in Table 34-7.

Table 34-7. Action-Qualifier Submodule Registers

AQCTLA 16h No Action-Qualifier Control Register For Output A (EPWMxA)

AQSFRC 1Ah No Action-Qualifier Software Force Register

AQCTLB 18h No Action-Qualifier Control Register For Output B (EPWMxB)

AQCSFRC 1Ch Yes Action-Qualifier Continuous Software Force

1732

Enhanced Pulse Width Modulator (ePWM) Module SPNU562–May 2014

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