Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G25/PMECC/REM9_5#0x0
PMECC REM 9 Register (sec_num = 5)
BCH Remainder 2 * N + 1
BCH Remainder 2 * N + 3
https://github.com/cmsis-svd/cmsis-svd-data