31
The 68000's Instruction Set
Attributes: Size = byte, word, longword
Description: Move the contents of the source to the destination location. The
data is examined as it is moved and the condition codes set
accordingly. Note that this is actually a copy command because
the source is not affected by the move. The move instruction has
the widest range of addressing modes of all the 68000s
instructions.
Condition codes: X N Z V C
- * * 0 0
Source operand addressing modes
Destination operand addressing modes
MOVEA Move address
Operation: [An] ← [source]
Syntax: MOVEA <ea>,An
Attributes: Size = word, longword
Description: Move the contents of the source to the destination location. The
destination is an address register. The source must be a word or
longword. If it is a word, it is sign-extended to a longword. The
condition codes are not affected.
Application: The MOVEA instruction is used to load an address register (some
assemblers simply employ the MOVE mnemonic for both MOVE and
MOVEA). Note that the instruction LEA can often be used to perform
the same operation (e.g., MOVEA.L #$1234,A0 is the same as
LEA $1234,A0).
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