MOTOROLA
MC68030 USER’S MANUAL
3-1
SECTION 3
INSTRUCTION SET SUMMARY
This section briefly describes the MC68030 instruction set. Refer to the MC68000PM/AD,
MC68000 Programmer's Reference Manual
, for complete details on the MC68030
instruction set.
The following paragraphs include descriptions of the instruction format and the operands
used by instructions, followed by a summary of the instruction set. The integer condition
codes and floating-point details are discussed. Programming examples for selected
instructions are also presented.
3.1 INSTRUCTION FORMAT
All MC68030 instructions consist of at least one word; some have as many as 11 words (see
Figure 3–1). The first word of the instruction, called the operation word, specifies the length
of the instruction and the operation to be performed. The remaining words, called extension
words, further specify the instruction and operands. These words may be floating-point
command words, conditional predicates, immediate operands, extensions to the effective
address mode specified in the operation word, branch displacements, bit number or bit field
specifications, special register specifications, trap operands, pack/unpack constants, or
argument counts.
Figure 3-1. Instruction Word General Format
15 0
OPERATION WORD(ONE WORD,
SPECIFIES OPERATION AND MODES)
SPECIAL OPERAND SPECIFIERS
(IF ANY, ONE OR TWO WORDS)
IMMEDIATE OPERAND OR SOURCE EFFECTIVE ADDRESS EXTENSION(
IF ANY, ONE TO SIX WORDS)
DESTINATION EFFECTIVE ADDRESS EXTENSION
(IF ANY, ONE TO SIX WORDS)
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