Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Renesas Electronics/R7FA2A1AB/SYSTEM/SOSCCR#0x0
SOSTP=0
Sub-clock Oscillator Control Register
Sub-Clock Oscillator Stop
0 (0): Sub-clock oscillator is operating.
1 (1): Sub-clock oscillator is stopped.
These bits are read as 0000000. The write value should be 0000000.
https://github.com/cmsis-svd/cmsis-svd-data