Ok, this is a little bit tricky. The register has 16bits, and some of the bits represent some state or function.
Bit 0: Set or read the status of the MWD
Bit 1: The MWD rebooted the boarde
other bits contain some debug information, which we haven't documented yet
So value 11 in decimal is 0000 0000 0000 1011 in binary. The bit no. 0 (first from the right) is 1, which means MWD is enabled. The bit no. 1 (second from the right) is 1, which means MWD already rebooted the board. Other bits don't apply to you.
You can "mask" the lowest 2 bits with boolean operation AND, typically with bit mask in hexadecimal representation:
register_6 && 0x0003
Or with binary mask:
register_6 && 0b11
I hope this helps you.