Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32U599/GTZC2_MPCBB4/MPCBB4_CR#0x0
MPCBB control register
lock the control register of the MPCBB until next reset
SRAMx clocks security state
secure read/write illegal access disable
https://github.com/cmsis-svd/cmsis-svd-data