UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 20 December 2013 726 of 841
NXP Semiconductors
UM10360
Chapter 34: Appendix: Cortex-M3 user guide
34.2.10.11 WFE
Wait For Event.
34.2.10.11.1 Syntax
WFE{cond}
where:
cond is an optional condition code, see Section 34.2.3.7 “
Conditional execution”
34.2.10.11.2 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 Section 34.3.5 “
Power management”.
34.2.10.11.3 Condition flags
This instruction does not change the flags.
34.2.10.11.4 Examples
WFE ; Wait for event
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