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2.2 Time-Base (TB) 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

2.2.1 Purpose of the Time-Base Submodule

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Time-Base (TB) Submodule

Each ePWM module has its own time-base submodule that determines all of the event timing for the

ePWM module. Built-in synchronization logic allows the time-base of multiple ePWM modules to work

together as a single system. Figure 2-1 illustrates the time-base module's place within the ePWM.

Figure 2-1. Time-Base Submodule Block Diagram

You can configure the time-base submodule for the following:

• Specify the ePWM time-base counter (TBCTR) frequency or period to control how often events occur.

• Manage time-base synchronization with other ePWM modules.

• Maintain a phase relationship with other ePWM modules.

• Set the time-base counter to count-up, count-down, or count-up-and-down mode.

• Generate the following events:

– CTR = PRD: Time-base counter equal to the specified period (TBCTR = TBPRD) .

– CTR = Zero: Time-base counter equal to zero (TBCTR = 0x0000).

• Configure the rate of the time-base clock; a prescaled version of the CPU system clock

(SYSCLKOUT). This allows the time-base counter to increment/decrement at a slower rate.

SPRU791F – November 2004 – Revised July 2009 ePWM Submodules 23

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