Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6M3AH/BUS/SDCCR#0x0
BSIZE=00, EXENB=0
SDC Control Register
Operation Enable
0 (0): Disable
1 (1): Enable
SDRAM Bus Width Select
0 (00): A 16-bit bus space
1 (01): Setting prohibited
2 (10): An 8-bit bus space
3 (11): Setting prohibited
https://github.com/cmsis-svd/cmsis-svd-data