Table 1-6 Effective Address Calculation
31
Register indirect with post-increment or pre-decrement
• Register indirect with post-increment
@ERn+
No.
Addressing Mode and Instruction Format
Effective Address Calculation
Effective Address (EA)
(1)
Register direct Rn
op
Regm Regn
Operands are contents of regm and regn
Register indirect @ERn
(2)
op
reg
Register indirect with displacement
@(d:16, ERn)
op
reg
disp
(3)
op
reg
• Register indirect with pre-decrement
@–ERn
op
reg
(4)
Register contents
Register contents
Sign extension
disp
Register contents
1, 2, or 4
Register contents
1, 2, or 4
Byte
Word
Longword
1
2
4
Operand Size Added Value
31
0
31
0
31
0
31
0
31
0
23
0
23
0
23
0
23
0