Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f1/STM32F100/SCB_ACTRL/ACTRL#0x0
Auxiliary control register
DISFOLD
FPEXCODIS
DISRAMODE
DISITMATBFLUSH
https://github.com/modm-io/cmsis-svd-stm32