HD64F2357VF13 Datasheet, PDF (71/1049 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

2.6.4 Basic Instruction Formats
The 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 2-9 shows examples of instruction formats.
(1) Operation field only
op
NOP, RTS, etc.
(2) Operation field and register fields
op
rn
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, etc.
(4) Operation field, effective address extension, and condition field
op
cc
EA (disp)
BRA d:16, etc.
Figure 2-9 Instruction Formats (Examples)
(1) 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 4 bits of the instruction. Some instructions have two operation
fields.
(2) Register Field: Specifies a general register. Address registers are specified by 3 bits, data registers by 3 bits or 4 bits.
Some instructions have two register fields. Some have no register field.
(3) Effective Address Extension: Eight, 16, or 32 bits specifying immediate data, an absolute address, or a displacement.
(4) Condition Field: Specifies the branching condition of Bcc instructions.
2.7 Addressing Modes and Effective Address Calculation
2.7.1 Addressing Mode
The CPU supports the eight addressing modes listed in table 2-4. Each instruction uses a subset of these addressing modes.
Arithmetic and logic instructions can use the register direct and immediate modes. Data transfer instructions can use all
addressing modes except program-counter relative and memory indirect. Bit manipulation instructions use register direct,
register indirect, or absolute addressing mode to specify an operand, and register direct (BSET, BCLR, BNOT, and BTST
instructions) or immediate (3-bit) addressing mode to specify a bit number in the operand.
Rev.6.00 Oct.28.2004 page 41 of 1016
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