SH7021 datasheet(45/509 Pages) RENESAS

tên linh kiện	SH7021

Giải thích chi tiết về linh kiện	SuperH??RISC engine

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24 RENESAS

Table 2.8

Addressing Modes and Effective Addresses (cont)

Addressing

Mode

Mnemonic

Expression

Effective Addresses Calculation

Equation

PC relative

addressing

with dis-

placement

@(disp:8,

PC)

The effective address is the PC value plus an 8-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. For a long word operation, the lowest two

bits of the PC are masked.

H'FFFFFFFC

PC + disp

× 2

PC & H'FFFFFFFC

+ disp

× 4

2/4

disp

(zero-extended)

*: For long word

Word: PC +

disp

× 2

Long word:

PC &

H'FFFFFFFC

+ disp

× 4

PC relative

addressing

disp:8

The effective address is the PC value sign-extended

with an 8-bit displacement (disp), doubled, and

added to the PC.

disp

(zero-extended)

PC + disp

× 2

PC + disp

× 2

disp:12

The effective address is the PC value sign-extended

with a 12-bit displacement (disp), doubled, and

added to the PC.

disp

(zero-extended)

PC + disp

× 2

PC + disp

× 2

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