Samsung C8274X Manuale Utente

 

WFI 

Operation: 

 

The CPU is effectively halted until an interrupt occurs, except that DMA transfers can still take 
place during this wait state. The WFI status can be released by an internal interrupt, including a 
fast interrupt. 

No flags are affected. 

  opc 

    1 

4n 

3F 

( n    =    1, 2, 3, … )

 

The following sample program structure shows the sequence of operations that follow a "WFI" 
statement: 

EI
WFI
(Next instruction)

Main program

Interrupt occurs

Interrupt service routine

Clear interrupt flag
IRET

Service routine completed

(Enable global interrupt)
(Wait for interrupt)