Atmel Evaluation Kit for the SAM4E Series of Flash Microcontrollers ATSAM4E-EK ATSAM4E-EK Data Sheet

SAM4E [DATASHEET]

Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14

218

Wait For Event.

Syntax

WFE{cond}

where:

cond

is an optional condition code, see 

.

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 

Condition Flags

This instruction does not change the flags.

Examples

WFE

; Wait for event 

Wait for Interrupt.

Syntax

WFI{cond}

where:

cond

is an optional condition code, see 

.

Operation

WFI is a hint instruction that suspends execution until one of the following events occurs:



An exception



A Debug Entry request, regardless of whether Debug is enabled.

Condition Flags

This instruction does not change the flags.

Examples

WFI ; Wait for interrupt