Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32L4x1/PWR/CR1#0x0
Power control register 1
Low-power mode selection
Disable backup domain write protection
Voltage scaling range selection
Low-power run
https://github.com/cmsis-svd/cmsis-svd-data