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one of 8086 processor control flags. controls the direction of string operations: DF = 0 => forward (left to right) processing; DF = 1 => backward (right to left) processing Instructions: MOVSB - copies contents of BYTE given by DS:SI into ES:DI MOVSW - copies contents of WORD given by DS:SI into ES:DI MOVSD - copies
Some of the most important and most frequently used instructions are those that move data. Without them, there Effective Address. 2 Data transfer instructions of 8086 microprocessor . The movsb instruction copies one byte from the memory location specified in esi to the location specified in edi . If the direction flag is
Opcode Instruction Clocks Description A4 MOVS m8,m8 7 Move byte [(E)SI] to ES:[(E)DI] A5 MOVS m16,m16 7 Move word [(E)SI] to ES:[(E)DI] A5 MOVS m32,m32 7 Move dword [(E)SI] to ES:[(E)DI] A4 MOVSB 7 Move byte DS:[(E)SI] to ES:[(E)DI] A5 MOVSW 7 Move word DS:[(E)SI] to ES:[(E)DI] A5 MOVSD 7 Move dword
To make DF = 1, use the std instruction. std ;set direction flag. cld and std have no effect on the other flags. Moving a String. Suppose we have defined two strings. DATASEG string1 DB "HELLO" string2 DB 5 DUP (?). The movsb instruction. movsb ;move string byte. copies the contents of the byte addressed by DS:SI to the
Opcode. Instruction. Description. A4. MOVS m8, m8. Move byte at address DS:(E)SI to address ES:(E)DI. A5. MOVS m16, m16. Move word at address DS:(E)SI to address ES:(E)DI. A5. MOVS m32, m32. Move doubleword at address DS:(E)SI to address ES:(E)DI. A4. MOVSB. Move byte at address DS:(E)SI to address ES:(E)
25 Dec 2016 If you add a special prefix called the repeat prefix in front of the MOVSB instruction, the MOVSB instruction will be repeated and CX decremented until CX is counted down to zero. - The source index register, SI must contain the offset of the start of the source string and the start of the destination location.
21 Dec 2015 Instruction Set of 8086 The 8086 instructions are categorized into the following main types. i PUSH: Push to Stack This instruction pushes the contents of the .. MOVSB / MOVSW :Move String Byte or String Word Suppose a string of bytes stored in a set of consecutive memory locations is to be moved to
These cause the instruction to be repeated the number of times in the count register, CX; for REPE and REPNE, the Zero flag is tested at the end of each operation and the loop is stopped if the condition (Equal or Not Equal to zero) fails. The MOVSB and MOVSW instructions have the following forms: MOVSB REP MOVSB
MOV AL, -5 ; AX = 000FBh (251). CBW. ; AX = 0FFFBh (-5). RET. CZSOPA unchanged. Clear Carry flag. Algorithm: CF = 0. Page 6 of 53. 8086 instructions MOVSB. No operands. Copy byte at DS:[SI] to ES:[DI]. Update SI and. DI. Algorithm: 0 ES:[DI] = DS:[SI]. 0 if DF = 0 then. 0 SI = SI + 1. 0 DI = DI + 1 else. 0 SI = SI -
After each move, SI and DI are automatically adjusted to point to the next source and destination respectively. The Direction Flag (DF) value determines whether SI and DI are to be incremented (DF = 0) or decremented (DF = 1) after each move. The MOVSB instruction tells the assembler to move data as bytes; the MOVSW
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