Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6T1AD/FCACHE/FLWT#0x0
FLWT=others
Flash Wait Cycle Register
Flash Wait Cycle
0 (000): 0 wait (ICLK<=80MHz)
0 (others): Setting prohibited
1 (001): 1 wait (80MHz < ICLK <=160MHz)
2 (010): 2 waits (160MHz < ICLK <=240MHz)
https://github.com/cmsis-svd/cmsis-svd-data