Table 3-7 Addressing Modes
No. Addressing Mode Mnemonic EA Field EA Extension
1 Register direct Rn 1 0 1 0 Sz r r r None
2 Register indirect @Rn 1 1 0 1 Sz r r r None
3 Register indirect @(d:8,Rn) 1 1 1 0 Sz r r r Displacement (1 byte)
with displacement
@(d:16,Rn) 1 1 1 1 Sz r r r Displacement (2 bytes)
4 Register indirect @–Rn 1 0 1 1 Sz r r r
with pre-decrement None
Register indirect @Rn+ 1 1 0 0 Sz r r r
with post-increment
5 Immediate #xx:8 0 0 0 0 0 1 0 0 Immediate data (1 byte)
#xx:16 0 0 0 0 1 1 0 0 Immediate data (2 bytes)
6 Absolute
*
3
@aa:8 0 0 0 0 Sz 1 0 1 1-Byte absolute address
(offset from BR)
@aa:16 0 0 0 1 Sz 1 0 1 2-Byte absolute address
7 PC-relative disp No EA field. 1- or 2-byte displacement
Addressing mode
is specified in the
operation code.
Notes: * 1 Sz: Specifies the operand size.
When Sz = 0: byte operand
When Sz = 1: word operand
* 2 rrr: Register number field, specifying a general register number.
0 0 0 — R0 0 0 1 — R1 0 1 0 — R2 0 1 1 — R3
1 0 0 — R4 1 0 1 — R5 1 1 0 — R6 1 1 1 — R7
* 3 The @aa:8 addressing mode is also referred to as the short absolute addressing mode.
*1 *2
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