Espressif ESP32 Technical Reference Manual page 438

16 Motor Control PWM (PWM)
Software-Force Events
There are two types of software-force events inside the PWM generator:
• Non-continuous-immediate (NCI) software-force events
Such types of events are immediately effective on PWM outputs when triggered by software. The forcing
is non-continuous, meaning the next active timing events will be able to alter the PWM outputs.
• Continuous (CNTU) software-force events
Such types of events are continuous. The forced PWM outputs will continue until they are released by
software. The events' triggers are configurable. They can be timing events or immediate events.
Figure 16-20 shows a waveform of NCI software-force events. NCI events are used to force PWMxA output low.
Forcing on PWMxB is disabled in this case.
Figure 16-20. Example of an NCI Software-Force Event on PWMxA
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ESP32 TRM (Version 5.2)