Datasheet

98
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
12.6.4.1 ADR
Load PC-relative address.
Syntax
ADR{cond} Rd, label
where:
cond is an optional condition code, see “Conditional Execution” .
Rd is the destination register.
label is a PC-relative expression. See “PC-relative Expressions” .
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 ADR is used to generate a target address for a BX or BLX instruction, ensure that bit[0] of the address generated is set
to 1 for correct execution.
Values of label must be within the range of −4095 to +4095 from the address in the PC.
Note: The user 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” .
Restrictions
Rd must not be SP and must not be PC.
Condition Flags
This instruction does not change the flags.
Examples
ADR R1, TextMessage ; Write address value of a location labelled as
;TextMessage to R1