Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32wl3/STM32WL33/DYNAMIC_REG/SNYTH_FREQ#0x0
SNYTH_FREQ register
Fractional part of the PLL fractional divide factor (default: 868 MHz, XTAL: 48 MHz)
PLL integer divide factor (default: 868 MHz, XTAL: 48 MHz)
Synthesizer band selector, i.
https://github.com/modm-io/cmsis-svd-stm32