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MOVE - Copy data from source to destination

Operation

[destination] ← [source]

Syntax

MOVE <ea>,<e>

Sample syntax

MOVE (A5),-(A2)
MOVE -(A5),(A2)+
MOVE #$123,(A6)+
MOVE Temp1,Temp2

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 68000's instructions.

Condition codes

X N Z V C
- * * 0 0

Source operand addressing modes

Dn An (An) (An)+ ‑(An) (d,An) (d,An,Xi) ABS.W ABS.L (d,PC) (d,PC,Xn) imm
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

Destination operand addressing modes

Dn An (An) (An)+ ‑(An) (d,An) (d,An,Xi) ABS.W ABS.L (d,PC) (d,PC,Xn) imm
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

MOVE to CCR - Copy data to CCR from source

Operation

[CCR] ← [source]

Syntax

MOVE <ea>,CCR

Attributes

Size word

Description

Move the contents of the source operand to the condition code register. The source operand is a word, but only the low-order byte contains the condition codes. The upper byte is neglected. Note that MOVE <ea>,CCR is a word operation, but ANDI, ORI, and EORI to CCR are all byte operations.

Application

The move to CCR instruction permits the programmer to preset the CCR. For example, MOVE #0,CCR clears all the CCR's bits.

Condition codes

X N Z V C
* * * * *

Source operand addressing modes

Dn An (An) (An)+ ‑(An) (d,An) (d,An,Xi) ABS.W ABS.L (d,PC) (d,PC,Xn) imm
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

MOVE from SR - Copy data from SR to destination

Operation

[destination] ← [SR]

Syntax

MOVE SR,<ea>

Attributes

Size word

Description

Move the contents of the status register to the destination location. The source operand, the status register, is a word. This instruction is not privileged in the 68000, but is privileged in the 68010, 68020, and 68030. Executing a MOVE SR,<ea> while in the user mode on these processors results in a privilege violation trap.

Condition codes

X N Z V C
- - - - -

Destination operand addressing modes

Dn An (An) (An)+ ‑(An) (d,An) (d,An,Xi) ABS.W ABS.L (d,PC) (d,PC,Xn) imm
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

MOVE to SR - Copy data to SR from source

Operation

IF [S] = 1
  THEN [SR] ← [source]
ELSE TRAP

Syntax

MOVE <ea>,SR

Attributes

Size word

Description

Move the contents of the source operand to the status register. The source operand is a word and all bits of the status register are affected.

Application

The MOVE to SR instruction allows the programmer to preset the contents of the status register. This instruction permits the trace mode, interrupt mask, and status bits to be modified. For example, MOVE #$2700,SR moves 00100111 00000000 to the status register which clears all bits of the CCR, sets the S-bit, clears the T-bit, and sets the interrupt mask level to 7.

Condition codes

X N Z V C
* * * * *

Source operand addressing modes

Dn An (An) (An)+ ‑(An) (d,An) (d,An,Xi) ABS.W ABS.L (d,PC) (d,PC,Xn) imm
✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓

MOVE USP - Copy data to or from USP

Operation 1

IF [S] = 1    {MOVE USP,An form}
  THEN [USP] ← [An]
ELSE TRAP

Operation 2

IF [S] = 1    {MOVE An,USP form}
  THEN [An] ← [USP]
ELSE TRAP

Syntax 1

MOVE USP,An

Syntax 2

MOVE An,USP

Attributes

Size longword

Description

Move the contents of the user stack pointer to an address register or vice versa. This is a privileged instruction and allows the operating system running in the supervisor state either to read the contents of the user stack pointer or to set up the user stack pointer.

Condition codes

X N Z V C
- - - - -

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