PM0214 datasheet(69/245 Pages) STMICROELECTRONICS

69 / 245 page

DocID022708 Rev 4

69/245

PM0214

The STM32 Cortex-M4 instruction set

244

3.4.1

ADR

Load PC-relative address.

Syntax

ADR{cond} Rd, label

where:

•

‘cond’ is an optional condition code (see Conditional execution on page 64)

•

‘Rd’ is the destination register

•

‘label’ is a PC-relative expression (see PC-relative expressions on page 64)

Operation

ADR determines the address by adding an immediate value to the PC. It 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 -4095 to 4095 from the address in the PC.

Note:

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 67).

Restrictions

Rd must be neither SP nor 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

PM0214 数据表(PDF) 69 Page - STMicroelectronics