Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Toshiba/M369/RMC/RSTAT#0x0
RMC Receive Status Register
RMCRNUM
RMCRLDR
RMCEDIF
RMCDMAXIF
RMCLOIF
RMCRLIF
https://github.com/cmsis-svd/cmsis-svd-data