SH7205 datasheet(87/1904 Pages) RENESAS

87 / 1904 page

Section 2 CPU

Rev. 1.00 Mar. 25, 2008 Page 55 of 1868

REJ09B0372-0100

(11) Absolute Address

When data is accessed by an absolute address, the absolute address value should be placed in the

memory table in advance. That value is transferred to the register by loading the immediate data

during the execution of the instruction, and the data is accessed in register indirect addressing

mode.

With the SH-2A, when data is referenced using an absolute address not exceeding 28 bits, it is also

possible to transfer immediate data located in the instruction code to a register and to reference the

data in register indirect addressing mode. However, when referencing data using an absolute

address of 21 to 28 bits, an OR instruction must be used after the data is transferred to a register.

Table 2.6

Absolute Address Accessing

Classification

SH-2A CPU

Example of Other CPU

Up to 20 bits

MOVI20

#H'12345,R1

MOV.B

@R1,R0

MOV.B

@H'12345,R0

21 to 28 bits

MOVI20S

#H'12345,R1

#H'67,R1

MOV.B

@R1,R0

MOV.B

@H'1234567,R0

29 bits or more

MOV.L

@(disp,PC),R1

MOV.B

@R1,R0

..................

.DATA.L

H'12345678

MOV.B

@H'12345678,R0

(12) 16-Bit/32-Bit Displacement

When data is accessed by 16-bit or 32-bit displacement, the displacement value should be placed

in the memory table in advance. That value is transferred to the register by loading the immediate

data during the execution of the instruction, and the data is accessed in the indexed indirect

Table 2.7

Displacement Accessing

Classification

SH-2A CPU

Example of Other CPU

16-bit displacement

MOV.W

@(disp,PC),R0

MOV.W

@(R0,R1),R2

..................

.DATA.W

H'1234

MOV.W

@(H'1234,R1),R2

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