stc

Set Carry Flag

STC

Sets the CF flag to 1.

Pseudocode Operation

CF ← 1

Encoding

Binary Layout

F9

+0

 

Format Legacy

Opcode F9

Extension Base

Operands

Related

More in Base

Reference

View in Intel® 64 and IA-32 Architectures SDM ↗ Intel® SDM

Instruction Forms

Opcode	Instruction	Op/En	64/32-bit Mode	CPUID	Description
F9	STC	ZO	Valid Valid		Set CF flag.

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. STC-Set Carry Flag Vol. 2B 4-671