INTERRUPT Using LPC2148 (ARM)

by embeddedbymedhavi in Circuits > Microcontrollers

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INTERRUPT Using LPC2148 (ARM)

arm7.jpg

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.

Steps in Executing an Interrupt:

  • 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

Program Interrupt 0 (INT0):

Downloads

ARM_interrupt.c

Simulation of Interrupt 0 (INT0):

ARM_interrupt.png

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