Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM3S1C/ACC/ACR#0x0
ISEL=LOPW
Analog Control Register
Current SELection
0 (LOPW): low power option.
1 (HISP): high speed option.
HYSTeresis selection
https://github.com/cmsis-svd/cmsis-svd-data