Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

4-330 Vol. 2B
INSTRUCTION SET REFERENCE, N-Z
STC—Set Carry Flag
Description
Sets the CF flag in the EFLAGS register.
This instruction’s operation is the same in non-64-bit modes and 64-bit mode.
Operation
CF ← 1;
Flags Affected
The CF flag is set. The OF, ZF, SF, AF, and PF flags are unaffected.
Exceptions (All Operating Modes)
None.
Opcode Instruction
64-Bit
Mode
Compat/
Leg Mode Description
F9 STC Valid Valid Set CF flag.