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Section 2 CPU
Page 60 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
2.3.2 Addressing Modes
Addressing modes and effective address calculation are as follows:
Table 2.8 Addressing Modes and Effective Addresses
Addressing
Mode
Instruction
Format
Effective Address Calculation
Equation
Register direct Rn The effective address is register Rn. (The operand
is the contents of register Rn.)
Register indirect @Rn The effective address is the contents of register Rn.
Rn Rn
Rn
Register indirect
with post-
increment
@Rn+ The effective address is the contents of register Rn.
A constant is added to the contents of Rn after the
instruction is executed. 1 is added for a byte
operation, 2 for a word operation, and 4 for a
longword operation.
Rn Rn
1/2/4
+
Rn + 1/2/4
Rn
(After
instruction
execution)
Byte:
Rn + 1 Rn
Word:
Rn + 2 Rn
Longword:
Rn + 4 Rn
Register indirect
with pre-
decrement
@-Rn The effective address is the value obtained by
subtracting a constant from Rn. 1 is subtracted for
a byte operation, 2 for a word operation, and 4 for
a longword operation.
Rn
1/2/4
Rn – 1/2/4
–
Rn – 1/2/4
Byte:
Rn – 1 Rn
Word:
Rn – 2 Rn
Longword:
Rn – 4 Rn
(Instruction is
executed with
Rn after this
calculation)