PM0214 datasheet(170/245 Pages) STMICROELECTRONICS

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The STM32 Cortex-M4 instruction set

PM0214

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DocID022708 Rev 4

3.11

Miscellaneous instructions

Table 36 shows the remaining Cortex-M4 instructions:

3.11.1

BKPT

Breakpoint.

Syntax

BKPT #imm

where:

•

‘imm’ is an expression evaluating to an integer in the range 0-255 (8-bit value).

Operation

The BKPT instruction causes the processor to enter Debug state. Debug tools can use this

to investigate system state when the instruction at a particular address is reached.

imm is ignored by the processor. If required, a debugger can use it to store additional

information about the breakpoint.

The BKPT instruction can be placed inside an IT block, but it executes unconditionally,

unaffected by the condition specified by the IT instruction.

Condition flags

This instruction does not change the flags.

Table 36. Miscellaneous instructions

Mnemonic

Brief description

See

BKPT

Breakpoint

BKPT on page 170

CPSID

Change Processor State, Disable Interrupts

CPS on page 171

CPSIE

Change Processor State, Enable Interrupts

CPS on page 171

DMB

Data Memory Barrier

DMB on page 172

DSB

Data Synchronization Barrier

DSB on page 172

ISB

Instruction Synchronization Barrier

ISB on page 173

MRS

Move from special register to register

MRS on page 173

MSR

Move from register to special register

MSR on page 174

NOP

No Operation

NOP on page 175

SEV

Send Event

SEV on page 175

SVC

Supervisor Call

SVC on page 176

WFE

Wait For Event

WFE on page 176

WFI

Wait For Interrupt

WFI on page 177

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