the AFS_SEL bits occupy bits 3 and 4 of the register at 0x1C. This means bit 0 of AFS_SEL is the same as bit 3 of the register and bit 1 of AFS_SEL is bit 4 in the register.
the AFS_SEL bits occupy bits 3 and 4 of the register at 0x1C. This means bit 0 of AFS_SEL is the same as bit 3 of the register and bit 1 of AFS_SEL is bit 4 in the register.