UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 20 December 2013 662 of 841
NXP Semiconductors
UM10360
Chapter 34: Appendix: Cortex-M3 user guide
34.2.4.1 ADR
Load PC-relative address.
34.2.4.1.1 Syntax
ADR
{cond} Rd, label
where:
cond is an optional condition code, see Section 34.2.3.7 “
Conditional execution”.
Rd is the destination register.
label is a PC-relative expression. See Section 34.2.3.6 “
PC-relative expressions”.
34.2.4.1.2 Operation
ADR
determines the address by adding an immediate value to the PC, and writes the result
to the destination register.
ADR
produces position-independent code, because the address is PC-relative.
If you use
ADR
to generate a target address for a
BX
or
BLX
instruction, you must ensure that
bit[0] of the address you generate is set to1 for correct execution.
Values of label must be within the range of 4095 to +4095 from the address in the PC.
Remark: You might have to use the
.W
suffix to get the maximum offset range or to
generate addresses that are not word-aligned. See Section 34.2.3.8 “
Instruction width
selection”.
34.2.4.1.3 Restrictions
Rd must not be SP and must not be PC.
34.2.4.1.4 Condition flags
This instruction does not change the flags.
34.2.4.1.5 Examples
ADR R1, TextMessage ; Write address value of a location labelled as
; TextMessage to R1
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