Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA6T1AD/SYSTEM/PLLCR#0x0
PLLSTP=0
PLL Control Register
PLL Stop Control
0 (0): Operate the PLL
1 (1): Stop the PLL.
https://github.com/cmsis-svd/cmsis-svd-data