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Unsigned Saturate to any bit position, with optional shift before saturating.

USAT{ cond } Rd , # sat , Rm {, shift }



is an optional condition code.


is the destination register.


specifies the bit position to saturate to, in the range 0 to 31.


is the register containing the operand.


is an optional shift. It must be one of the following:

ASR #n

where n is in the range 1-32 (ARM) or 1-31 (Thumb).

LSL #n

where n is in the range 0-31.


The USAT instruction applies the specified shift to a signed value, then saturates to the unsigned range 0 ≤ x ≤ 2sat – 1.

Register restrictions

You cannot use PC for any register.

You can use SP in ARM instructions but this is deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.

Q flag

If saturation occurs, this instruction sets the Q flag. To read the state of the Q flag, use an MRS instruction.


This ARM instruction is available in ARMv6 and above.

This 32-bit Thumb instruction is available in ARMv6T2 and above.

There is no 16-bit version of this instruction in Thumb.


 USATNE  r0, #7, r5
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