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C-9
INSTRUCTION SET DESCRIPTIONS
CLI Clear Interrupt-enable Flag:
CLI
Zeroes the interrupt-enable flag (IF).
When the interrupt-enable flag is
cleared, the 8086 and 8088 do not
recognize an external interrupt request
that appears on the INTR line; in other
words maskable interrupts are
disabled. A non-maskable interrupt
appearing on NMI line, however, is
honored, as is a software interrupt.
Instruction Operands:
none
(IF) ← 0AF–
CF –
DF –
IF
OF –
PF –
SF –
TF –
ZF –
CMC Complement Carry Flag:
CMC
Toggles complement carry flag (CF) to
its opposite state and affects no other
flags.
Instruction Operands:
none
if
(CF) = 0
then
(CF) ← 1
else
(CF) ← 0
AF –
CF
DF –
IF –
OF –
PF –
SF –
TF –
ZF –
Table C-4. Instruction Set (Continued)
Name Description Operation
Flags
Affected
NOTE: The three symbols used in the Flags Affected column are defined as follows:
– the contents of the flag remain unchanged after the instruction is executed
? the contents of the flag is undefined after the instruction is executed
the flag is updated after the instruction is executed