16.5.2.4.2 Retriggerable Mode

The retriggerable mode is selected when TRGMOD[1:0] = 01. This mode provides the same operation as Single Trigger mode. This mode is different from Single Trigger mode because a PWM cycle may be restarted before the end of a cycle that is already in progress. If the TRGCNT[2:0] bits have been written to produce a multiple cycle PWM event, the count will also be reset whenever a new trigger is received. If the update bit is set, the update happens at the start of the PWM cycle. However, if output mode is set to push-pull, the update only happens when STEER = 1. This mode can be especially useful when a PWM generator is synchronized to an external, off-chip source that operates from a different clock source. Due to the asynchronous nature of the clock source, the SOC trigger may occur slightly before or slightly after the end of a PWM cycle. If the SOC trigger arrives before the end of the PWM cycle, this trigger mode allows a new PWM cycle to be started.