Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Spansion/MB9AF42xL/MFS0/UART_SMR#0x0
register UART_SMR
bitfield SOE
bitfield BDS
bitfield SBL
bitfield WUCR
bitfield MD
https://github.com/cmsis-svd/cmsis-svd-data