PM0214 datasheet(171/245 Pages) STMICROELECTRONICS

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DocID022708 Rev 4

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PM0214

The STM32 Cortex-M4 instruction set

244

Examples

BKPT 0xAB

; Breakpoint with immediate value set to 0xAB (debugger can

; extract the immediate value by locating it using the PC)

3.11.2

CPS

Change processor state.

Syntax

CPSeffect iflags

where:

•

‘effect’ is one of:

IE: Clears the special purpose register.

ID: Sets the special purpose register.

•

‘iflags’ is a sequence of one or more flags:

i: Set or clear PRIMASK.

f: Set or clear FAULTMASK.

Operation

CPS changes the PRIMASK and FAULTMASK special register values. See Exception mask

registers on page 22 for more information about these registers.

Restrictions

The restrictions are:

•

Use CPS only from privileged software, it has no effect if used in unprivileged software

•

CPS cannot be conditional and so must not be used inside an IT block.

Condition flags

This instruction does not change the condition flags.

Examples

CPSID i

; Disable interrupts and configurable fault handlers (set PRIMASK)

CPSID f

; Disable interrupts and all fault handlers (set FAULTMASK)

CPSIE i

; Enable interrupts and configurable fault handlers(clear PRIMASK)

CPSIE f

; Enable interrupts and fault handlers (clear FAULTMASK)

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