Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
CLD/STD Instruction
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  Title:    Clear or Set Direction Flag           Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   CLD                                            ±
            STD
 
  See also: MOVS, CMPS, SCAS, LODS, STOS
 
  Description:
 
     CLD clears the direction flag. All subsequent string instructions
     will process up (from low addresses to high addresses) by
     increasing the appropriate index registers.
 
     STD sets the direction flag. All subsequent string instructions
     will process down (from high addresses to low addresses).
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