Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAME51J19A/SDHC0/CACR#0x0
Capabilities Control
Capabilities Registers Write Enable (Required to write the correct frequencies in the Capabilities Registers)
Key (0x46)
https://github.com/cmsis-svd/cmsis-svd-data