3.5.2.2 Loop Instructions. The loop instructions are conditional jumps that use a value placed in ECX to specify the number of repetitions of a software loop. All loop instructions automatically decrement ECX and terminate the loop when ECX=0. Four of the five loop instructions specify a condition involving ZF that terminates the loop before This instruction loads new values into the specified register and into the ES register from four successive memory locations. The word from the first two memory locations is copied into the specified register, and 8086 will generate a type 0 interrupt. All flags are undefined after a DIV instruction. If you want to divide a byte by a byte In Loop While Jump instructions are used to jump from one block of statement into another block of statements. It is used when we want to skip certain number of loops either by using break or continue. And GOTO statement (a part of jump statement) is used to move to designated part of loop according to choice of an user. Contact Us Quora User The CALL instruction is used to Program Execution Transfer Instructions in 8086 Microprocessor to a subprogram or procedure. There are two basic types of CALLs, near and far. A near CALL is a call to a procedure which is in the same code segment as the CALL instruction. When the 8086 executes a near CALL instruction it decrements the stack The 8086 microprocessor supports 8 types of instructions −. 01:Data Transfer Instructions. 02:Arithmetic Instructions. 03:Bit Manipulation Instructions. 04:String Instructions. 05:Program Execution Transfer Instructions (Branch & Loop Instructions) 06:Processor Control Instructions. 4) Register Indirect Addressing Mode. In this offset address of data is in either Bx, SI, DI, (Base register, source index or Destination index) default segment is either DS or ES. Data is supposed to be available at the address pointed to by the content of any of the above registers in the default data segment. The major difference between interrupt service routines and standard procedures is that you can have any number of different procedures in an assembly language program, while the system supports a maximum of 256 different interrupt service routines. 6.9.4 The Conditional Jump Instructions. Although the jmp, Although the loop instruction Instruction Set of 8086 Instructions are classified on the basis of functions they perform. They are categorized into the following main types: Data Transfer instruction All the instructions which perform data movement come under this category. Jump instructions Prepared by: Group 4 f (cmp) Instruction The Compare compare (cmp) instruction is identical to the sub instruction with one crucial semantic difference does not retain the difference it computers (does not stores the results); it just sets the condition code bits in the flag register. The syntax for the cmp instruction Compare Instructions Jump instructions Prepared by: Group 4 (cmp) Instruction The Compare compare (cmp) instruction is identical to the sub instruction with one crucial semantic difference -does not retain the difference it computers (does not stores the results); it just sets the condition code bits in the flag register. The syntax for the cmp instruction similar to that sub instruction 8086 JNP Branch Instruction Assembly Example. The JNP instruction checks the parity