INTERRUPT Using AVR:

Interrupts:

• An interrupt is an external or internal event that interrupts the microcontroller to inform it that a device needs its service.
• Interrupts vs. Polling • A single microcontroller can serve several devices. •
• There are two ways to do that: – interrupts – Polling. •
• The program which is associated with the interrupt is called the interrupt service routine (ISR) or interrupt handler.

• Finish current instruction and saves the PC on stack.
• Jumps to a fixed location in memory depend on type of interrupt
• Starts to execute the interrupt service routine until RETI (return from interrupt)
• Upon executing the RETI the microcontroller returns to the place where it was interrupted. Get pop PC from stack

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