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Chapter 17 -- 80386 Instruction Set
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CLD -- Clear Direction Flag
Opcode Instruction Clocks Description
FC CLD 2 Clear direction flag; SI and DI
will increment during string
instructions
Operation
DF := 0;
Description
CLD clears the direction flag. No other flags or registers are affected.
After CLD is executed, string operations will increment the index registers
(SI and/or DI) that they use.
Flags Affected
DF := 0
Protected Mode Exceptions
None
Real Address Mode Exceptions
None
Virtual 8086 Mode Exceptions
None
up:
Chapter 17 -- 80386 Instruction Set
prev: CLC Clear Carry Flag
next: CLI Clear Interrupt Flag