8086 Instructions - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. 8086 instructions with examples. 8086 instructions with examples. Open navigation menu. Close AAD, CBW, and CWD Arithmetic Instructions (cont.) EXAMPLE: The 2s-complement signed data contents of AL are 1 1 Instruction set of 8086 The instruction set of 8086 can be classified into following groups 1. All the conditional flags are affected by SUB instruction. Example: SUB BX,DX SBB : Subtract with Borrow SBB X,Y X = X - Y - BW(CY) X destination, Y Source, BW Borrow i.e., Carry flag contents. (i.e., < 80H) Then AH 0000 0000 (00H) CWD Instruction. Description. MOV. Moves data from register to register, register to memory, memory to register, memory to accumulator, accumulator to memory, etc. LDS. Loads a word from the specified memory locations into specified register. It also loads a word from the next two memory locations into DS register. LES. Intel 8086 Instruction Set - authorSTREAM Presentation. Presentations (PPT, KEY, PDF) The IRET instruction is used at the end of the interrupt service routine to return execution to the interrupted program. The 8086 copies return address from stack into IP and CS registers and the stored value of flags back to the flag register. Note : The RET instruction does not copy the flags from the stack back to the flag register. View Notes - Lecture-18.pdf from CS 101 at National University of Computer and Emerging Sciences, Islamabad. Arithmetic Instructions 8086 P has variety of arithmetic instructions 8086 arithmetic CBW - 8086. Convert byte into word. Algorithm: If high bit of AL = 1 then: AH = 255 (0FFh) Else : AH = 0. View instruction_code_8086.pdf from ECE 3004 at IIT Kanpur. Complete 8086 instruction set Quick When immediate is greater then 1, assembler generates several RCL xx, 1 instructions because 8086 has machine code only for this instruction (the same principle works for all other shift/rotate instructions). Algorithm: shift all bits left, the bit that goes off is set to CF and previous value of CF is inserted to the right-most position. Example: - CWD also known as the Convert signed Word to signed Double word instruction, it is used to extend the sign bit of a word in AX register to all the bits of the DX register. Instruction Set of 8086 An instruction is a binary pattern designed inside a microprocessor to perform a specific function. The AAD instruction can modify PF, SF and ZF flags. Example Assembly Code ORG 100h .MODEL SMALL .CODE MOV AX,3730H ;ASCII for 70 MOV BL,03H ;Load 03H into BL AAD DIV BL RET The "MOV AX,3730H" instruction store 37 into the AH register and 30 into the AL register. The instruction AAD will multiply AH by 10 and will add to AL. The AL becomes: