14.9.2.2 Mask Bits
The mask object is used to ignore selected bits of the received
identifier. The masked bits (mask bits with a value of ‘0
’) of the RXMAB will not be compared with the bits in the filter object.
For example, to receive all messages with Identifiers 0, 1, 2 and 3, it is required to
mask the lower two bits of the identifier by clearing the corresponding bits of the mask
object.