Instruction Set CLD
CLD -- Clear Direction Flag
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