CMC             Complement Carry Flag                Flags: O D I T S Z A P C
                                                            - - - - - - - - *
CMC

        Logic   CF ← NOT(CF)

    CMC reverses the state of the carry flag (CF).

    
    Opcode      Format
    F5          CMC


    Length and timing
    Operands    Bytes   8088    186     286     386     486     Pentium
    -            1       2       2       2       2       2       2   NP