Cps - ST STM32F4 Series Programming Manual

PM0214
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
registers on page 22
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
CPSID f
CPSIE i
CPSIE f
for more information about these registers.
; Disable interrupts and configurable fault handlers (set PRIMASK)
; Disable interrupts and all fault handlers (set FAULTMASK)
; Enable interrupts and configurable fault handlers(clear PRIMASK)
; Enable interrupts and fault handlers (clear FAULTMASK)
DocID022708 Rev 6
The STM32 Cortex-M4 instruction set
Exception mask
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