Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Infineon/XMC4300/SCU_HIBERNATE/OSCSICTRL#0x0
PWD=Const_0
fOSI Control Register
Turn OFF the fOSI Clock Source
0 (Const_0): Enabled
1 (Const_1): Disabled
https://github.com/cmsis-svd/cmsis-svd-data