MOV

MOV

Instruction	MOV[S]
Function	Move data into register
Category	Data processing
ARM family	All
Notes	-

MOV[S] : Move

MOV will move data into the specified register.

Operand 1 may be another register, a shifted register, or an immediate value (which may be shifted).

If the S bit is set (MOVS), the N and Z flags are set according to the value moved (after shifting, if shifter used), and the C flag is set by the shifter.

MOV is useful for transferring the contents of registers, setting registers prior to specific operations, perform a shift without requiring more complicated maths (LSL #x to multiply by 2x), update PC to return after a subroutine (the infamous MOV PC, LR).

Use MVN to place negative values into registers.

Syntax

  MOV<suffix>  <dest>, <op 1>

Function

  dest = op_1

Example

  MOV  R0, R0         ; equivalent to a NOP
  MOV  R0, R0, LSL#3  ; R0 = R0 * 8

Technical

The instruction bit pattern is as follows:

31 - 28	27	26	25	24 - 21	20	19 - 16	15 - 12	11 - 0
condition	0	0	I	1 1 0 1	S	0 0 0 0	dest	op/shift