HD64F3687HV Datasheet, PDF (66/538 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

Section 2 CPU
2.4.2 Basic Instruction Formats
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.
• 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.
(1) Operation field only
op
(2) Operation field and register fields
op
rn
NOP, RTS, etc.
rm
ADD.B Rn, Rm, etc.
(3) Operation field, register fields, and effective address extension
op
rn
EA(disp)
rm
MOV.B @(d:16, Rn), Rm
(4) Operation field, effective address extension, and condition field
op
cc
EA(disp)
BRA d:8
Figure 2.7 Instruction Formats
Rev.5.00 Nov. 02, 2005 Page 32 of 500
REJ09B0027-0500