SH7660 datasheet(86/846 Pages) RENESAS

86 / 846 page

Rev. 1.00, 02/04, page 48 of 804

Literal Constant: Byte literal constant is placed inside the instruction code as immediate data.

Since the instruction length is fixed to 16 bits, word or longword literal constant is not placed

inside the instruction code, but stored as a table in main memory. The table in memory is

referenced with a MOV instruction using PC-relative addressing mode with displacement. An

example is shown below.

MOV.W

@(disp, PC), R0

Absolute Addresses: The absolute address value should be placed in a table in main memory as

well as word or longword literal constant. This value is transferred to a register and the operand

access is specified using indexed register indirect addressing mode. The absolute address value is

stored in a register during execution of an instruction. This is also applied to the word or longword

immediate data.

16-Bit/32-Bit Displacement: When data is referenced with a 16- or 32-bit displacement, the

displacement value is placed in a table in memory beforehand. As well as the absolute addresses,

this value is transferred to a register and the operand access is specified using indexed register

indirect addressing mode. The displacement value is stored in a register during execution of an

instruction. This is also applied to the word or longword immediate data.

SH7660 Folha de dados(PDF) 86 Page - Renesas Technology Corp