PM0223 datasheet(46/110 Pages) STMICROELECTRONICS

Part #	PM0223

Description	This programming manual provides information for application and system-level software developers

PDF	110 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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46 / 110 page

The STM32L0 Cortex-M0+ Instruction Set

PM0223

46/110

DocID025763 Rev 1

3.4.1

ADR

Generates a PC-relative address.

Syntax

ADR Rd, label

where:

Operation

ADR

generates an address by adding an immediate value to the PC, and writes the result to

the destination register.

ADR

facilitates the generation of 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 to 1 for correct execution.

Restrictions

In this instruction 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.

Is the destination register.

label

Is a PC-relative expression. See 3.3.5: PC-relative expressions on page 42.

PM0223 Datasheet(PDF) 46 Page - STMicroelectronics