Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wb0/STM32WB05/RADIO_CONTROL_REG/CLK32PERIOD_REG#0x0
CLK32PERIOD_REG register
indicates slow clock period information.
https://github.com/modm-io/cmsis-svd-stm32