Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6T1AD/SYSTEM/SCKDIVCR2#0x0
UCK=others
System Clock Division Control Register 2
USB Clock (UCLK) Select
0 (others): Setting prohibited
2 (010): /3
3 (011): /4
4 (100): /5
https://github.com/cmsis-svd/cmsis-svd-data