SH7708 datasheet(40/633 Pages) RENESAS

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2.3.2

Addressing Modes

Addressing modes and effective address calculation methods are shown in table 2.2.

Table 2.2

Addressing Modes and Effective Addresses

Addressing

Mode

Instruction

Format

Effective Address Calculation Method

Calculation Formula

Effective address is register Rn. (Operand is

—

indirect

@Rn

Effective address is register Rn contents.

indirect with

post-increment

@Rn+

Effective address is register Rn contents. A

constant is added to Rn after instruction

execution: 1 for a byte operand, 2 for a word

operand, 4 for a longword operand.

1/2/4

Rn + 1/2/4

After instruction

execution

Byte: Rn + 1

→ Rn

Word: Rn + 2

→ Rn

Longword: Rn + 4

→ Rn

indirect with

pre-decrement

@–Rn

Effective address is register Rn contents,

decremented by a constant beforehand: 1 for

a byte operand, 2 for a word operand, 4 for a

longword operand.

1/2/4

Rn – 1/2/4

–

Rn – 1/2/4

Byte: Rn – 1

→ Rn

Word: Rn – 2

→ Rn

Longword: Rn – 4

→ Rn

(Instruction executed

with Rn after

calculation)

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