Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/NXP Semiconductors/NeoM3/FLASHCTRL/EEPWRDWN#0x0
EEPROM power-down register
Power down mode bit. 0: not in power down mode. 1: power down mode (this will put all EEPROM devices in power down).
Reserved. Read value is undefined, only zero should be written.
https://github.com/cmsis-svd/cmsis-svd-data