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TMS320F28379D: PWM AQSFRC register

Part Number: TMS320F28379D

Hi, I want to clarify the AQSFRC.RLDCSF register.

In TRM, it's said

AQCSFRC Active Register Reload From Shadow Options
00: Load on event counter equals zero
01: Load on event counter equals period
10: Load on event counter equals zero or counter equals period
11: Load immediately (the active register is directly accessed by the
CPU and is not loaded from the shadow register).

what's event counter here? Is it TBCTR?