Instruction Set Summary; Instruction Format - Motorola MC68030 User Manual

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 effec-
tive address mode specified in the operation word, branch displacements,
bit number or bit field specifications, special register specifications, trap op-
erands, pack/unpack constants, or argument counts.
15
OPERATION WORD
(ONE WORD, SPECIFIES OPERATION AND MODESI
SPECIAL OPERAND SPECIFIERS
(IF ANY, ONE OR TWO WORDSI
IMMEDIATE OPERAND OR SOURCE EFFECTIVE ADDRESS EXTENSION
(IF ANY, ONE TO SIX WORDSI
DESTINATION EFFECTIVE ADDRESS EXTENSION
(IF ANY, ONE TO SIX WORDSI
Figure 3-1. Instruction Word General Format
MOTOROLA
MC68030 USER'S
MANUAL 3-1
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