November 2021
Intermediate to advanced
672 pages
25h 6m
English
Content preview from Microprocessors and Microcomputer-Based System Design, 2nd Edition
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5.5 68000 Instruction Set
The 68000 instruction set contains 56 basic instructions. Table 5.3 lists them in alphabetical order. Table 5.4 lists those affecting the condition codes. The repertoire is very versatile and offers an efficient means to handle high-level language data structures (such as arrays and linked lists). Note that in order to identify the operand size of an instruction, the following is placed after a 68000 mnemonic: .B for byte, .W or none for word, .L for long word. For example:
ADD.B D0, D1 ; [D1]8 ← [D0]8 + [D1]8
ADD.W or ADD D0, D1 ; [D1]16 ← [D0]16 + [D1]16
ADD.L D0, D1 ; [D1]32 ← [D0]32 + [D1]32
Instruction |
Size |
Length (words) |
Operation |
|---|---|---|---|
ABCD − (Ay), ... |
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