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(nasm.info)Section B.4.20

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B.4.20. `CLC', `CLD', `CLI', `CLTS': Clear Flags
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     CLC                           ; F8                   [8086]
     CLD                           ; FC                   [8086]
     CLI                           ; FA                   [8086]
     CLTS                          ; 0F 06                [286,PRIV]

   These instructions clear various flags. `CLC' clears the carry flag;
`CLD' clears the direction flag; `CLI' clears the interrupt flag (thus
disabling interrupts); and `CLTS' clears the task-switched (`TS') flag
in `CR0'.

   To set the carry, direction, or interrupt flags, use the `STC',
`STD' and `STI' instructions (*Note Section B.4.301::). To invert the
carry flag, use `CMC' (*Note Section B.4.22::).