HD6433682 ETC, HD6433682 Datasheet - Page 62

• Manufacturer Part Number: HD6433682
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series
• Manufacturer: ETC

2.4.2
H8/300H 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 2.7 shows examples of instruction formats.
Rev. 3.00, 05/03, page 32 of 472
Operation 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.
Register Field
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.
Effective Address Extension
8, 16, or 32 bits specifying immediate data, an absolute address, or a displacement. A24-bit
address or displacement is treated as a 32-bit data in which the first 8 bits are 0 (H'00).
Condition Field
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
op
op
Figure 2.7 Instruction Formats
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
BRA d:8