Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6M3AH/BUS/SDSELF#0x0
SFEN=0
SDRAM Self-Refresh Control Register
SDRAM Self-Refresh Enable
0 (0): Disable
1 (1): Enable
https://github.com/cmsis-svd/cmsis-svd-data