Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/DBGMCU/PIDR4#0x0
Debug MCU CoreSight peripheral identity register 4
JEP106 continuation code
register file size
https://github.com/modm-io/cmsis-svd-stm32