SH7018 datasheet(33/431 Pages) RENESAS

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Table 2.5

Immediate Data Accessing

Classification

SH7018 CPU

Example of Conventional CPU

8-bit immediate

MOV

#H'12,R0

MOV.B

#H'12,R0

16-bit immediate

MOV.W

@(disp,PC),R0

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

.DATA.W

H'1234

MOV.W

#H'1234,R0

32-bit immediate

MOV.L

@(disp,PC),R0

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

.DATA.L

H'12345678

MOV.L

#H'12345678,R0

Note:

@(disp, PC) accesses the immediate data.

Absolute Address: When data is accessed by absolute address, the value already in the absolute

address is placed in the memory table. Loading the immediate data when the instruction is

executed transfers that value to the register and the data is accessed in the indirect register

addressing mode (table 2.6).

Table 2.6

Absolute Address Accessing

Classification

SH7018 CPU

Example of Conventional CPU

Absolute address

MOV.L

@(disp,PC),R1

MOV.B

@R1,R0

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

.DATA.L

H'12345678

MOV.B

@H'12345678,R0

Note:

@(disp,PC) accesses the immediate data.

16-Bit/32-Bit Displacement: When data is accessed by 16-bit or 32-bit displacement, the pre-

existing displacement value is placed in the memory table. Loading the immediate data when the

instruction is executed transfers that value to the register and the data is accessed in the indirect

indexed register addressing mode (table 2.7).

Table 2.7

Displacement Accessing

Classification

SH7018 CPU

Example of Conventional CPU

16-bit displacement

MOV.W

@(disp,PC),R0

MOV.W

@(R0,R1),R2

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

.DATA.W

H'1234

MOV.W

@(H'1234,R1),R2

Note:

@(disp,PC) accesses the immediate data.

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