SH7021 datasheet(44/509 Pages) RENESAS

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Table 2.8

Addressing Modes and Effective Addresses (cont)

Addressing

Mode

Mnemonic

Expression

Effective Addresses Calculation

Equation

Indirect

addressing

with

displace-

ment

@(disp:4,

Rn)

The effective address is Rn plus a 4-bit displacement

(disp). disp is zero-extended, and remains the same

for a byte operation, is doubled for a word operation,

and is quadrupled for a long word operation.

Rn + disp

× 1/2/4

1/2/4

disp

(zero-extended)

Byte: Rn +

disp

Word: Rn +

disp

× 2

Long word:

Rn + disp

× 4

Indirect

indexed

addressing

@(R0, Rn)

The effective address is the Rn value plus R0.

Rn + R0

Indirect

GBR

addressing

with

displace-

ment

@(disp:8,

GBR)

The effective address is the GBR value plus an 8-bit

displacement (disp). The value of disp is zero-

extended, and remains the same for a byte

operation, is doubled for a word operation, and is

quadrupled for a long word operation.

GBR

1/2/4

GBR

+ disp

× 1/2/4

disp

(zero-extended)

Byte: GBR +

disp

Word: GBR +

disp

× 2

Long word:

GBR + disp

Indirect

indexed

GBR

addressing

@(R0,

GBR)

The effective address is the GBR value plus the R0.

GBR

GBR + R0

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