Table 2-13 Effective Address Calculation
Addressing Mode and
Instruction Format
No.
Effective Address Calculation
Effective Address
Register direct (Rn)
1
Operand is general
register contents
op
rm
rn
Register indirect (@ERn)
2
op
r
General register contents
31
0
23
0
Register indirect with displacement
@(d:16, ERn)/@(d:24, ERn)
3
op
r
General register contents
31
0
23
0
disp
Sign extension
disp
Register indirect with post-increment
or pre-decrement
4
General register contents
31
0
23
0
1, 2, or 4
op
r
General register contents
31
0
23
0
1, 2, or 4
op
r
1 for a byte operand, 2 for a word
operand, 4 for a longword operand
Register indirect with post-increment
@ERn+
Register indirect with pre-decrement
@–ERn
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