Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F7x8/TIM1/AF2#0x0
alternate function option register 2
BRK2 BKIN input enable
BRK2 DFSDM_BREAK enable
BRK2 BKIN2 input polarity
https://github.com/cmsis-svd/cmsis-svd-data