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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