Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/ADF1/ADF_SITF0CR#0x0
ADF serial interface control register 0
SITFEN
SCKSRC
SITFMOD
STH
SITFACTIVE
https://github.com/modm-io/cmsis-svd-stm32