MC68000 MOTOROLA [Motorola, Inc], MC68000 Datasheet - Page 33

• Manufacturer Part Number: MC68000
• Manufacturer: MOTOROLA [Motorola, Inc]

2.2 INSTRUCTION SET SUMMARY
The five data types supported by the M68000 on the MC68302 are bits, binary-coded deci-
mal (BCD) digits (4 bits), bytes (8 bits), words (16 bits), and long words (32 bits).
In addition, operations on other data types, such as memory addresses, status word data,
etc., are provided for in the instruction set. Shown in Table 2-1, the 14 flexible addressing
modes include six basic types:
The capability to perform postincrementing, predecrementing, offsetting, and indexing is in-
cluded in the register indirect addressing modes. Program counter relative modes can also
be modified via indexing and offsetting.
The M68000 instruction set is shown in Table 2-2.
Some basic instructions also have variations as shown in Table 2-3.
Special emphasis has been placed on the instruction set to simplify programming and to
support structured high-level languages. With a few exceptions, each instruction operates
MOTOROLA
CONDITION
• Register Direct
• Register Indirect
• Absolute
• Immediate
• Program Counter Relative
• Implied
CODES
SUPERVISOR
INTERRUPT
OVERFLOW
NEGATIVE
EXTEND
TRACE
CARRY
STATE
MODE
MASK
ZERO
15
T
Figure 2-2. M68000 Status Register
13
S
MC68302 USER’S MANUAL
SYSTEM
BYTE
I2
10
I1
I0
8
MC68000/MC68008 Core
X
4
USER
BYTE
N
Z
V
C
0
2-3