In 8086 microprocessor the following has the highest priority among all types of interrupts:

The different types of interrupts present in 8086 microprocessors are given by:

1. Hardware Interrupts:

INTR:

- It provides a single interrupt request and is activated by I/O port

- This interrupt can be masked or delayed

- It is a level triggered interrupt

NMI

- It is a single pin non maskable hardware interrupt which cannot be disabled

- It is the highest priority interrupt in 8086 microprocessors

- After its execution, this interrupt generates a TYPE 2 interrupt

- IP is loaded from word location 00008 H and CS is loaded from the word location 0000A H

2. Software Interrupts:

- These are instructions that are inserted within the program to generate interrupts

- There are 256 software interrupts in 8086 microprocessors

Some important software interrupts are:

- (A) TYPE 0 corresponds to division by zero (0)

- (B) TYPE 1 is used for single step execution for debugging of program

- (C) TYPE 2 represents NMI and is used in power failure conditions

- (D) TYPE 3 represents a break-point interrupt

- (E) TYPE 4 is the overflow interrupt