SH7713 datasheet(85/904 Pages) RENESAS

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Section 2 CPU

Rev.1.50 Aug. 30, 2006 Page 45 of 860

REJ09B0288-0150

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

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

inside the instruction code, but in a table in memory. The table in memory is referenced with a

MOV instruction using PC-relative addressing mode with displacement.

Example:

MOV.W

@(disp, PC)

Absolute Addresses: When data is referenced by absolute address, the absolute address value is

placed in a table in memory beforehand as well as word or longword literal constant. Using the

method whereby immediate data is loaded when an instruction is executed, this value is

transferred to a register and the data is referenced using register indirect addressing mode.

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. Using the method whereby word or

longword immediate data is loaded when an instruction is executed, this value is transferred to a

2.5.2

CPU Instruction Addressing Modes

The following table shows addressing modes and effective address calculation methods for

instructions executed by the CPU core.

Table 2.3

Addressing Modes and Effective Addresses for CPU Instructions

Addressing

Mode

Instruction

Format

Effective Address Calculation Method

Calculation

Formula

direct

Effective address is register Rn.

(Operand is register Rn contents.)

—

indirect

@Rn

Effective address is register Rn contents.

indirect with

post-increment

@Rn+

Effective address is register Rn contents.

A constant is added to Rn after instruction

execution: 1 for a byte operand, 2 for a

word operand, 4 for a longword operand.

1/2/4

Rn + 1/2/4

After instruction

execution

Byte: Rn + 1

→ Rn

Word: Rn + 2

→ Rn

Longword: Rn + 4

→

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