CLC (instruction x86)

See also: CLC

CLC is an instruction for the processors of the family x86.

Description

The instruction CLC is a Mnémonique for Cl ear C arry Flag (the flag of reserve Disarms). This instruction disarms, i.e. puts at zero, the flag of reserve CF (bit 0 of the register EFLAGS).

Instruction CLC is a basic instruction of the processors x86. It was implemented on the first processor of this family, the 8086.

affected Flags

Only the flag of reserve CF of register EFLAGS is affected. None of the other flags is changed.

Generated exceptions

This instruction does not generate any exception in any of the three operating processes of the processor x86 (real Mode, virtual Mode 8086, Mode protected).

Example of use

The examples suggested are valid only for the processors x86.

Language Assembler

  • MASM (Intel Syntax) 
	mov Al, 0FFh
	add Al, 1; the CF is armed after this addition
	CLC; disarm the CF
	jc @retenue; the conditional jump is not taken!
	nop; this instruction will be well carried out
@retenue:

See too

  • STC - the instruction reverses CLC.
  • EFLAGS - in particular the part on the flag of reserve CF
  • Instruction set x86

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