Setting and Clearing
The flag may be set or cleared using the CLI (Clear Interrupts), STI (Set Interrupts) and POPF (Pop Flags) instructions.
CLI clears IF (sets to 0), while STI sets IF to 1. POPF pops 16 bits off the stack into the FLAGS register, which means IF will be set or cleared based on the ninth bit on the top of the stack.
Read more about this topic: Interrupt Flag
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