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This output pulse is used to synchronize the counter of an ePWM module later in the synchronization chain. The ePWM module generates this signal from one of three event sources:
1. EPWMxSYNCI (Synchronization input pulse)
2. CTR = Zero: The time-base counter equal to zero (TBCTR = 0x00).
3. CTR = CMPB: The time-base counter equal to the counter-compare B (TBCTR = CMPB) register.
