HSIZE[1:0] defines transfer size and determines values of low-order address bits HADDR[1:0], that appear in the HADDR column of Table 5.1 as b or bb. An eight-bit transfer does not affect HADDR[1:0]. A 16-bit transfer forces HADDR[0] to 0. A 32-bit transfer forces HADDR[1:0] to b00.