h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 80

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 2 CPU
2.6.2
The H8S/2600 CPU instructions consist of 2-byte (1-word) units. An instruction consists of an
operation field (op field), a register field (r field), an effective address extension (EA field), and a
condition field (cc).
Figure 2.11 shows examples of instruction formats.
• Operation Field
• Register Field
• Effective Address Extension
• Condition Field
Rev. 2.00 Dec. 05, 2005 Page 42 of 724
REJ09B0200-0200
Indicates the function of the instruction, the addressing mode, and the operation to be carried
out on the operand. The operation field always includes the first four bits of the instruction.
Some instructions have two operation fields.
Specifies a general register. Address registers are specified by 3 bits, and data registers by 3
bits or 4 bits. Some instructions have two register fields. Some have no register field.
8, 16, or 32 bits specifying immediate data, an absolute address, or a displacement.
Specifies the branching condition of Bcc instructions.
Basic Instruction Formats
(1) Operation field only
(2) Operation field and register fields
(3) Operation field, register fields, and effective address extension
(4) Operation field, effective address extension, and condition field
op
Figure 2.11 Instruction Formats (Examples)
op
op
cc
EA(disp)
op
r n
r n
EA(disp)
r m
r m
NOP, RTS, etc.
ADD.B Rn, Rm, etc.
MOV.B @(d:16, Rn), Rm, etc.
BRA d:16, etc.