p2125vps20 Renesas Electronics Corporation., p2125vps20 Datasheet - Page 83

• Manufacturer Part Number: p2125vps20
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

2.6.2
The H8S/2000 CPU instructions consist of 2-byte (1-word) units. An instruction consists of an
operation field (op), a register field (r), an effective address extension (EA), and a condition field
(cc).
Figure 2.11 shows examples of instruction formats.
• Operation field
• Register field
• Effective address extension
• Condition field
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-bit, and data registers by 3-bit
or 4-bit. Some instructions have two register fields, and some have no register field.
8-, 16-, or 32-bit 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
Rev. 1.00 Sep. 21, 2006 Page 45 of 658
NOP, RTS
ADD.B Rn, Rm
MOV.B @(d:16, Rn), Rm
BRA d:16
REJ09B0310-0100
Section 2 CPU