STC

STC

Intel Architecture Software Developer's Manual (July 2017)

STC - Set Carry Flag

Opcode	Instruction	Op/ En	64-Bit Mode	Compat/ Leg Mode	Description
F9	STC	ZO	Valid	Valid	Set CF flag.

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
ZO	NA	NA	NA	NA

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.