Std instruction in 8086

 

 

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which flag is used in string instructions for auto increment /decrement
cld in microprocessor
cld instruction in 8086
lodsb instruction in 8086
cld instruction in 8086 example
cld assemblycmpsb instruction in 8086
rep instruction in 8086

 

 

STD. No operands. Set Direction flag. SI and DI will be decremented by chain instructions: CMPSB, CMPSW, LODSB,. LODSW, MOVSB, MOVSW, STOSB, STOSW. In case it is set to 1 (using the set-direction-flag instruction STD ) — the string is processed from highest to lowest address. This is called auto- This instruction is used to set the Direction Flag to 1 so that SI/DI will automatically decrement when one of the string instructions executes. Usage STD. Opcode, Instruction, Op/En, 64-bit Mode, Compat/Leg Mode, Description. FD, STD, ZO, Valid, Valid, Set DF flag. Instruction Operand Encoding ¶ Opcode Instruction Clocks Description FD STD 2 Set direction flag so (E)SI and/or (E)DI decrement Virtual 8086 Mode Exceptions.Microprocessor - 8086 Instruction Sets, The 8086 microprocessor supports 8 types of instructions ? STD ? Used to set the direction flag DF to 1. Instructions > Clear Direction Flag (cld). IA-32 Assembly Language Reference Manual. Previous: Set Interrupt Flag (sti) · Next: Set Direction Flag (std)

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