ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Assembler syntax
MOV{S} , # All encodings permitted
MOVW , # Only encoding T3 or A2 permitted
where:
Instruction Details
S If S is present, the instruction updates the flags. Otherwise, the flags are not updated.
See Standard assembler syntax fields on page A8-7.
The destination register.
The immediate value to be placed in . The range of values is 0-255 for encoding T1 and
0-65535 for encoding T3 or A2. See Modified immediate constants in Thumb instructions
on page A6-17 or Modified immediate constants in ARM instructions on page A5-9 for the
range of values for encoding T2 or A1.
When both 32-bit encodings are available for an instruction, encoding T2 or A1 is preferred
to encoding T3 or A2 (if encoding T3 or A2 is required, use the MOVW syntax).
The pre-UAL syntax MOVS is equivalent to MOVS.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
result = imm32;
if d == 15 then // Can only occur for encoding A1
ALUWritePC(result); // setflags is always FALSE here
else
R[d] = result;
if setflags then
APSR.N = result;
APSR.Z = IsZeroBit(result);
APSR.C = carry;
// APSR.V unchanged
Exceptions
None.
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-195