OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 399

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
25.4.5.7.4 Condition flags
25.4.5.7.5 Examples
25.4.5.8.1 Syntax
25.4.5.8.2 Operation
25.4.5.8.3 Restrictions
25.4.5.8.4 Condition flags
25.4.5.8.5 Examples
25.4.5.8 SXT and UXT
25.4.5.9 TST
These instructions do not change the flags.
Sign extend and Zero extend.
SXTB Rd, Rm
SXTH Rd, Rm
UXTB Rd, Rm
UXTH Rd, Rm
where:
These instructions extract bits from the resulting value:
In these instructions, Rd and Rm must only specify R0-R7.
These instructions do not affect the flags.
Test bits.
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•
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Rd is the destination register.
Rm is the register holding the value to be extended.
REV
SXTB extracts bits[7:0] and sign extends to 32 bits
UXTB extracts bits[7:0] and zero extends to 32 bits
SXTH extracts bits[15:0] and sign extends to 32 bits
UXTH extracts bits[15:0] and zero extends to 32 bits.
SXTH R4, R6
REV16 R0, R0 ; Reverse byte order of each 16-bit halfword in R0
REVSH R0, R5 ; Reverse signed halfword
UXTB R3, R1
R3, R7 ; Reverse byte order of value in R7 and write it to R3
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 10 March 2011
; Obtain the lower halfword of the
; value in R6 and then sign extend to
; 32 bits and write the result to R4.
; Extract lowest byte of the value in R10 and zero
; extend it, and write the result to R3
Chapter 25: LPC122x Appendix ARM Cortex-M0
UM10441
© NXP B.V. 2011. All rights reserved.
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