Motorola CPU32 Manuel d'utilisateur Page 560

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Instruction Format Summary
8-4
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
MOTOROLA
8.1.8 Size Field
This field specifies the size of the operation. The encoding is as follows:
00 — Byte Operation
01 — Word Operation
10 — Long Operation
8.1.9 Opmode Field
Refer to the applicable instruction descriptions for the encoding of this field in
Section 4
Integer Instructions
,
Section 5 Floating Point Instructions
,
Section 6 Supervisor
(Privaleged) Instructions
, and
Section 7 CPU32 Instructions
.
8.1.10 Address/Data Field
This field specifies the type of general register. The encoding is:
0 Data Register
1 Address Register
8.2 OPERATION CODE MAP
Table 8-2 lists the encoding for bits 15 – 12 and the operation performed.
Table 8-2. Operation Code Map
Bits 15 – 12 Operation
0000 Bit Manipulation/MOVEP/Immed iate
0001 Move Byte
0010 Move Long
0011 Move Word
0100 Miscellaneous
0101 ADDQ/SUBQ/Scc/DBcc/TRAPc c
0110 Bcc/BSR/BRA
0111 MOVEQ
1000 OR/DIV/SBCD
1001 SUB/SUBX
1010 (Unassigned, Reserved)
1011 CMP/EOR
1100 AND/MUL/ABCD/EXG
1101 ADD/ADDX
1110 Shift/Rotate/Bit Field
1111
Coprocessor Interface/MC68040 and
CPU32 Extensions
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