80386 Programmer's Reference Manual -- Opcode CLI

CLI -- Clear Interrupt Flag

OpcodeInstructionClocks DescriptionExample
FAcli 3 Clear interrupt flagcli


IF := 0;


CLI clears the interrupt flag if the current privilege level is at least as privileged as IOPL. No other flags are affected. External interrupts are not recognized at the end of the CLI instruction or from that point on until the interrupt flag is set.

Flags Affected

IF := 0

Protected Mode Exceptions

#GP(0) if the current privilege level is greater (has less privilege) than the IOPL in the flags register. IOPL specifies the least privileged level at which I/O can be performed.

Real Address Mode Exceptions


Virtual 8086 Mode Exceptions

#GP(0) as for Protected Mode

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