PM0056 datasheet(60/156 Pages) STMICROELECTRONICS

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The Cortex-M3 instruction set

PM0056

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DocID15491 Rev 5

3.4

Memory access instructions

Table 24 shows the memory access instructions:

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 57)

•

‘Rd’ is the destination register

•

‘label’ is a PC-relative expression (see PC-relative expressions on page 56)

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.

Table 24. Memory access instructions

Mnemonic

Brief description

Section

ADR

Load PC-relative address

ADR on page 60

CLREX

Clear exclusive

CLREX on page 71

LDM{mode}

Load multiple registers

LDM and STM on page 67

LDR{type}

Load register using immediate offset

LDR and STR, immediate offset on page 61

LDR{type}

Load register using register offset

LDR and STR, register offset on page 63

LDR{type}T

Load register with unprivileged access

LDR and STR, unprivileged on page 64

LDR

Load register using PC-relative address LDR, PC-relative on page 65

LDREX{type} Load register exclusive

LDREX and STREX on page 70

POP

Pop registers from stack

PUSH and POP on page 68

PUSH

Push registers onto stack

PUSH and POP on page 68

STM{mode}

Store multiple registers

LDM and STM on page 67

STR{type}

Store register using immediate offset

LDR and STR, immediate offset on page 61

STR{type}

Store register using register offset

LDR and STR, register offset on page 63

STR{type}T

Store register with unprivileged access LDR and STR, unprivileged on page 64

STREX{type} Store register exclusive

LDREX and STREX on page 70

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