UXTB

Unsigned extend byte

This instruction extracts an 8-bit value from a register, zero-extends it to the size of the register, and writes the result to the destination register.

Encoding: With zeros to left and right

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
0	1	0	1	0	0	1	1	0	0	0	0	0	0	0	0	0	0	0	1	1	1
sf	opc								N	immr						imms						Rn					Rd

32-bit

UXTB <Wd>, <Wn>

Equivalent to: UBFM <Wd>, <Wn>, #0, #7

Explanations

<Wd>: Is the 32-bit name of the general-purpose destination register, encoded in the "Rd" field.
<Wn>: Is the 32-bit name of the general-purpose source register, encoded in the "Rn" field.

Operational Notes

If PSTATE.DIT is 1:

• The execution time of this instruction is independent of:
  • The values of the data supplied in any of its registers.
  • The values of the NZCV flags.
• The response of this instruction to asynchronous exceptions does not vary based on:
  • The values of the data supplied in any of its registers.
  • The values of the NZCV flags.