10. MPMC:: Interrupt Structure of 8086 - 2021.04.20

3/4 ECE:: SECOND SEMESTER (2020-21)

subject: Microprocessors and Microcontrollers (R1632041)

Interrupts of 8086:

Microprocessor can be interrupted from normal execution of instructions and asked to execute some other instructions called " Interrupt Service Routine (ISR)".

The microprocessor can resume its operation after completing the ISR

Broadly there are two types of interrupts :
1. External Interrupts
2.Internal interrupts

In general the interrupts can be classified in the following types :

1. Hardware and software Interrupts
2 .Maskable and Non-maskable interrupts
3.Vectored and Non-vectored interrupts

The interrupts of 8086 are :
1. Hardware Interrupts
2 .Software Interrupts
3. Divide -by - Zero Interrupt (Type -0 Interrupt)
4. Single Step (or) TRAP Interrupt (Type -1 Interrupt)
5. Non-Maskable Interrupt (NMI) (Type-2 Interrupt )
6. Break-point Interrupt (Type -3 Interrupt)
7. Overflow Interrupt (Type -4 Interrupt)