Hi
The FIRCREGOFF bit is used to control an internal regulator used by the FIRC internal circuit. In order to guarantee the operation frequency of the FIRC at voltage levels higher than 3V, the application must be sure to set this bit. Otherwise, FIRC operational frequency may get out of spec.
If you don't use FIRC, I think you can set FIRCREGOFF=1 for power saving purposes.
Best Regards,
Robin
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