Table 7.1 Addressing Modes and Effective Addresses (cont)
Addressing Instruction
Calculation
Formula
Mode
Format
Effective Address Calculation Method
Register
indirect with
displacement
@(disp:4, Rn) Effective address is register Rn contents with
4-bit displacement disp added. After disp is
Byte: Rn +
disp → EA
zero-extended, it is multiplied by 1 (byte), 2 (word),
or 4 (longword), according to the operand size.
Word: Rn +
disp × 2 → EA
Rn
Longword:
Rn + disp × 4
→ EA
disp
(zero-extended)
+
Rn + disp × 1/2/4
×
1/2/4
Indexed
register
indirect
@(R0, Rn)
Effective address is sum of register Rn and R0
contents.
Rn + R0 → EA
Rn
+
Rn + R0
R0
GBR indirect @(disp:8,
Effective address is register GBR contents with
8-bit displacement disp added. After disp is
zero-extended, it is multiplied by 1 (byte), 2 (word),
or 4 (longword), according to the operand size.
Byte: GBR +
disp → EA
with
GBR)
displacement
Word: GBR +
disp × 2 → EA
GBR
Longword:
GBR + disp ×
4 → EA
GBR
+ disp × 1/2/4
disp
(zero-extended)
+
×
1/2/4
Indexed
GBR indirect
@(R0, GBR) Effective address is sum of register GBR and R0
contents.
GBR + R0 →
EA
GBR
+
GBR + R0
R0
Rev. 6.0, 07/02, page 176 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
