PM0215 datasheet(42/91 Pages) STMICROELECTRONICS

No. de pieza	PM0215

Descripción Electrónicos	STM32F0xxx Cortex-M0 programming manual

PDF	91 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

Logo

42 / 91 page

The STM32 Cortex-M0 instruction set

PM0215

42/91

Doc ID 022979 Rev 1

3.4.1

ADR

Load PC-relative address.

Syntax

ADR Rd, label

where:

●

‘Rd’ is the destination register

●

‘label’ is a PC-relative expression (see PC-relative expressions on page 39)

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.

Restrictions

Rd must specify R0-R7. The data-value addressed must be word aligned and within 1020

bytes of the current 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

ADR

R3, [PC,#996]

; Set R3 to value of PC + 996.

PM0215 Datasheet(PDF) 42 Page - STMicroelectronics