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The loop instruction automatically decrements cx, and only jumps if cx != 0. There are also LOOPE, and LOOPNE variants, if you want to do some additional check for your loop to break out early. If you want to modify cx during your loop, make sure to push it onto the stack before the loop content, and pop it
21 Dec 2015 Instruction Set of 8086 The 8086 instructions are categorized into the following main types. i. Data Copy / Transfer Instructions ii. Arithmetic and Logical Instructions iii. Branch Instructions iv. Loop Instructions v. Machine Control Instructions vi. Flag Manipulation Instructions vii. Shift and Rotate Instructions viii
MOV CX, N Begin : -- -- DEC CX JNZ Begin. Loop Instructions: loop instructions are used to simplify the decrementing, testing and branching portion of the loop. In the above case this portion required two instructions, but in more complicated situation may require more than two instructions. The loop instruction for 8086 all
The 8086 microprocessor supports 8 types of instructions ?. Data Transfer Instructions; Arithmetic Instructions; Bit Manipulation Instructions; String Instructions; Program Execution Transfer Instructions (Branch & Loop Instructions); Processor Control Instructions; Iteration Control Instructions; Interrupt Instructions. Let us now
LOOP Label 1. Conditional Branch Instructions. When this instruction is executed, execution control is transferred to the address specified relatively in the instruction, provided the condition implicit in the Opcode is satisfied. Otherwise execution continues sequentially. JZ/JE Label. Transfer execution control to address
Function 2 INT 21H - BIOS Routine to Print a Character to Display. Normally, the 8086 fetches instructions from sequential memory locations and places them into an instruction queue. Many instructions simply perform a specific operation on one of the processor's registers or on the data contained in a memory location.
5 Nov 2016
LOOP label Decrease CX, jump to label if CX not zero. Algorithm: bullet, CX = CX - 1. bullet, if CX <> 0 then. bullet, jump. else. bullet, no jump, continue. Example: include 'emu8086.inc' #make_COM# ORG 100h MOV CX, 5 label1: PRINTN 'loop!' LOOP label1 RET
Binary Arithmetic Instructions · Data Transfer Instructions · Jump / Branch Instrructions · Logical Instructions · Loop Instructons · NOP n HLT Instructions · Packed BCD Adjust Instructions · Sign Extension Instructions · Unpacked BCD Arithmetic Instructions
26 Jan 2013 loop: Repeating a sequence of instructions a certain number of times is called a loop. Loop action is performed by. DJNZ reg, Label. The register is decremented; If it is not zero, it jumps to the target address referred to by the label; Prior to the start of loop the register is loaded with the counter for the number
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