Rev. 1.0, 02/00, page 51 of 1141
Table 2.13
Effective Address Calculation
No.
Addressing Mode and
Instruction Format
Effective Address
Calculation
Effective Address (EA)
1
Register direct (Rn)
op
rm rn
Operand is general register
contents
2
Register indirect (@ERn)
General register contents
31
0
31
0
r
op
24 23
Don’t
care
3
Register indirect with displacement
@(d:16, ERn) or @(d:32, ERn)
General register contents
Sign extension
disp
31
0
31
0
31
0
op
r
disp
Don’t
care
24 23
4
Register indirect with post-increment or pre-decrement
•
Register indirect with post-increment @ERn+
General register contents
1, 2, or
4
31
0
31
0
r
op
Don’t
care
24 23
•
Register indirect with pre-decrement @–ERn
General register contents
1, 2, or
4
Byte
Word
Longword
1
2
4
Operand
Size
Value
Added
31
0
31
0
op
r
Don’t
care
24 23