SH7785 datasheet(79/1692 Pages) RENESAS

79 / 1692 page

3. Instruction Set

Rev.1.00 Jan. 10, 2008 Page 49 of 1658

REJ09B0261-0100

Addressing

Mode

Instruction

Format

Effective Address Calculation Method

Calculation

Formula

GBR indirect

with displace-

ment

@(disp:8,

GBR)

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.

GBR

1/2/4

GBR

+ disp

× 1/2/4

disp

(zero-extended)

Byte: GBR +

disp

→ EA

Word: GBR +

disp

× 2 → EA

Longword:

GBR + disp

→ EA

Indexed GBR

indirect

@(R0, GBR)

Effective address is sum of register GBR and R0

contents.

GBR

GBR + R0

→

PC-relative

with

displacement

@(disp:8, PC)

Effective address is PC + 4 with 8-bit displacement

disp added. After disp is zero-extended, it is

multiplied by 2 (word), or 4 (longword), according

to the operand size. With a longword operand,

the lower 2 bits of PC are masked.

H'FFFF FFFC

PC + 4 + disp

× 2

or PC &

H'FFFF FFFC

+ 4 + disp

× 4

2/4

& *

disp

(zero-extended)

* With longword operand

Word: PC + 4

+ disp

× 2 →

Longword:

PC & H'FFFF

FFFC + 4 +

disp

× 4 → EA

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