Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/SAI1/BSLOTR#0x0
B Slot register
First bit offset
Slot size
Number of slots in an audio frame
Slot enable
https://github.com/modm-io/cmsis-svd-stm32