Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM3U2E/ADC12B/MR#0x0
Mode Register
Trigger Enable
Trigger Selection
Resolution
Sleep Mode
Prescaler Rate Selection
Start Up Time
Sample & Hold Time
https://github.com/cmsis-svd/cmsis-svd-data