Revisions Affected

0

Details

When SDFM comparator settings—such as filter type, lower/upper threshold, or comparator OSR (COSR) settings—are dynamically changed during run time, spurious comparator events will be triggered. The spurious comparator event will trigger a corresponding CPU interrupt, ePWM X-BAR events, and GPIO output X-BAR events if configured appropriately.

Workaround

When comparator settings need to be changed dynamically, follow the procedure below to ensure spurious comparator events do not generate a CPU interrupt or X-BAR events (ePWM X-BAR/GPIO output X-BAR events):

1. Disable the comparator filter.
2. Delay for at least a latency of the comparator filter + 3 SD-Cx clock cycles.
3. Change comparator filter settings such as filter type, COSR, or lower/upper threshold.
4. Delay for at least a latency of the comparator filter + 5 SD-Cx clock cycles.
5. Enable the comparator filter.