Discuss different types of interrupt.



The following image shows the types of interrupts we have in a 8086 microprocessor -

Hardware interrupt: Hardware interrupt is caused by any peripheral device by sending a signal through a specified pin to the microprocessor.
The 8086 has two hardware interrupt pins, i.e. NMI and INTR, NMI is a non-mask able interrupt and INTR is a mask able interrupt having lower priority. One more interrupt pin associated is INTA called interrupt acknowledge.
(i) NMI
(ii) INTR
Software Interrupts: Some instructions are inserted at the desired position into the program to create interrupts. These interrupt instructions can be used to test the working of various interrupt handlers. It includes –
INT - Interrupt instruction with type number.
INT 3 - Break Point Interrupt Instruction

INTO - Interrupt on overflow instruction 


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