Datasheet

95
SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
10.12.1 ADR
Load PC-relative address.
10.12.1.1 Syntax
ADR{cond} Rd, label
where:
cond is an optional condition code, see “Conditional execution” on page 91.
Rd is the destination register.
label is a PC-relative expression. See “PC-relative expressions” on page 90.
10.12.1.2 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.
You might have to use the .W suffix to get the maximum offset range or to generate addresses that are not word-
aligned. See “Instruction width selection” on page 92.
10.12.1.3 Restrictions
Rd must not be SP and must not be PC.
10.12.1.4 Condition flags
This instruction does not change the flags.
10.12.1.5 Examples
ADR R1, TextMessage ; Write address value of a location labelled as
; TextMessage to R1