moveq.md

MOVEQ - Move quick (copy a small literal to a destination)

Operation

[destination] ← <literal>

Syntax

MOVEQ #<data>,Dn

Attributes

Size longword

Description

Move the specified literal to a data register. The literal data is an eight-bit field within the MOVEQ op-code and specifies a signed value in the range -128 to +127. When the source operand is transferred, it is sign-extended to 32 bits. Consequently, although only 8 bits are moved, the MOVEQ instruction is a longword operation.

Application

MOVEQ is used to load small integers into a data register. Beware of its sign-extension. The two operations MOVE.B #12,D0 and MOVEQ #12,D0 are not equivalent. The former has the effect [D0(0:7)] ← 12, while the latter has the effect [D0(0:31)] ← 12 (with sign-extension).

Condition codes

X	N	Z	V	C
-	*	*	0	0

From MOTOROLA M68000 FAMILY Programmer's reference manual. Copyright 1992 by Motorola Inc./NXP. Adapted with permission.