Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/AT91SAM9G20/DBGU/BRGR#0x0
CD=DISABLED
Baud Rate Generator Register
Clock Divisor
0 (DISABLED): DBGU Disabled
1 (MCK): MCK
https://github.com/cmsis-svd/cmsis-svd-data