Wait for Interrupt.
is an optional condition code.
This is a hint instruction. It is optional whether this instructionis implemented or not. If this instruction is not implemented, itexecutes as a
NOP. The assembler producesa diagnostic message if the instruction executes as a
NOP onthe target.
WFI suspends execution until oneof the following events occurs:
- An IRQ interrupt, regardless of the CPSR I-bit.
- An FIQ interrupt, regardless of the CPSR F-bit.
- An Imprecise Data abort, unless masked by the CPSR A-bit.
- A Debug Entry request, regardless of whether Debug is enabled.
This instruction is available in A32 and T32.