Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32L1xx/FSMC/BTR1#0x0
BTR1
ADDSET
ADDHLD
DATAST
BUSTURN
CLKDIV
DATLAT
ACCMOD
https://github.com/cmsis-svd/cmsis-svd-data