Cortex-M3 Processor (Reference Material)
UG0331 User Guide Revision 15.0 93
3.6.10.11.1 Syntax
WFE{cond}
where:
cond is an optional condition code, see Conditional Execution, page 55.
3.6.10.11.2 Operation
WFE
is a hint instruction.
If the event register is 0,
WFE
suspends execution until one of the following events occurs:
• an exception, unless masked by the exception mask registers or the current priority level
• an exception enters the Pending state, if
SEVONPEND
in the System Control Register is set
• a Debug Entry request, if Debug is enabled
• an event signaled by a peripheral or another processor in a multiprocessor system using the
SEV
instruction.
If the event register is 1,
WFE
clears it to 0 and returns immediately.
For more information see Power Management, page 45.
Condition flags
This instruction does not change the flags.
Examples
WFE ; Wait for event
3.6.10.12 WFI
Wait for Interrupt.
3.6.10.12.1 Syntax
WFI{cond}
where:
cond is an optional condition code, see Conditional Execution, page 55.
3.6.10.12.2 Operation
WFI
is a hint instruction that suspends execution until one of the following events occurs:
• a non-masked interrupt occurs and is taken
• an interrupt masked by PRIMASK becomes pending
• a Debug Entry request.
3.6.10.12.3 Condition Flags
This instruction does not change the flags.
Examples
WFI ; Wait for interrupt
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