35.5.3.1.1 Address With Mask (CTRLB.AMODE = 0X0)

An address written to the Address bits in the Address register (ADDR.ADDR), and a mask written to the Address Mask bits in the Address register (ADDR.ADDRMASK) will yield an address match if the bit values in the shift register match the values in the Address register OR the associated bit in the Address Mask register is a 1. All bits that are masked are not included in the match. Note that writing the ADDR.ADDRMASK to 'all zeros' will match a single unique address, while writing ADDR.ADDRMASK to 'all ones' will result in all addresses being accepted.