Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6M1AD/USBFS/DEVADD2#0x0
USBSPD=00
Device Address 2 Configuration Register
Transfer Speed of Communication Target Device
0 (00): DEVADDn is not used
1 (01): Low speed
2 (10): Full speed
3 (11): Setting prohibited
https://github.com/cmsis-svd/cmsis-svd-data