单操作数间接寻址方框图 ARO BK lk ARP(3) ARADO ARO(16)index AR1(16) +-%0B AR2(16 DAB(16) AR3(16) ARO BK AR4(16) AR5(16 ARAU1 AR7(16) BK(16) (write)or CAB(16) (32-bit read Data bus DB(16) Data bus EB(16)单操作数间接寻址方框图