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RETFIE

June 23, 20191 min read

Return from Interrupt

Return from interrupt. The stack is POPed and the top of the stack (TOS) is loaded into the program counter. This is a two-cycle instruction.

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Syntax:

[ label ] RETFIE

Operation:

TOS → PC,

1 → GIE or PEIE,

 

Operands:

  • None

Status Affected: GIE, PEIE

Example:

ISR       ;interrupt service routine
BCF INTCON,GIE
BCF INTCON,TMR0IE
...
...
BSF INTCON,GIE 
BSF INTCON,TMR0IE
RETFIE    ;exit interrupt service routine

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Roland Pelayo started TMM in 2015. He is a firmware engineer who has over ten years of experience in developing electronic and microcontroller-based systems. Roland's designs include medical devices, security and automation, robots, emergency alert systems, and educational training modules.   Have something that you like Roland to write about here? or do you need consultation for microcontroller firmware projects? just contact him via the contact page.