STC — Set Carry Flag
| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description |
|---|---|---|---|---|---|
| F9 | STC | ZO | Valid | Valid | Set CF flag. |
Instruction Operand Encoding ¶
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
| ZO | N/A | N/A | N/A | N/A |
Description ¶
Sets the CF flag in the EFLAGS register. Operation is the same in all modes.
Operation ¶
CF := 1;
Flags Affected ¶
The CF flag is set. The OF, ZF, SF, AF, and PF flags are unaffected.
Exceptions (All Operating Modes) ¶
#UD If the LOCK prefix is used.