SH7261 datasheet(61/1348 Pages) RENESAS

tên linh kiện	SH7261

Giải thích chi tiết về linh kiện	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

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Section 2 CPU

Rev. 2.00 Sep. 07, 2007 Page 29 of 1312

REJ09B0320-0200

2.2.3

Immediate Data Format

Byte (8-bit) immediate data is located in an instruction code. Immediate data accessed by the

MOV, ADD, and CMP/EQ instructions is sign-extended and handled in registers as longword

data. Immediate data accessed by the TST, AND, OR, and XOR instructions is zero-extended and

handled as longword data. Consequently, AND instructions with immediate data always clear the

upper 24 bits of the destination register.

20-bit immediate data is located in the code of a MOVI20 or MOVI20S 32-bit transfer instruction.

The MOVI20 instruction stores immediate data in the destination register in sign-extended form.

The MOVI20S instruction shifts immediate data by eight bits in the upper direction, and stores it

in the destination register in sign-extended form.

Word or longword immediate data is not located in the instruction code, but rather is stored in a

memory table. The memory table is accessed by an immediate data transfer instruction (MOV)

using the PC relative addressing mode with displacement.

See examples given in section 2.3.1 (10), Immediate Data.

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