Скачать или смотреть Microcontroller PIC16F887 Video 37 What is Interrupt How To Enable External Interrupt

Interrupt

A single microcontroller can serve several devices. There are two methods by which devices receive service from the microcontroller: interrupts or polling. In polling, the microcontroller continuously monitors the status of a given device; when the status condition is met, it performs the serviced. After that it moves on to monitor the next device until each one is serviced. In the interrupt method, whenever any device needs the microcontroller’s service, the device notifies it by sending an interrupt signal. Upon receiving an interrupt signal, the microcontroller stops whatever it is doing and serves the device. The program associated with the interrupt is called the interrupt service routine (ISR).

The first thing the microcontroller does when an interrupt request arrives is to execute the current instruction and then stops the regular program execution. As a result, the current program memory address is automatically pushed onto the stack and the default address (predefined by the manufacturer) is written to the program counter. The location from where the program proceeds with execution is called an interrupt vector.

How to enable external interrupt.

Project Description

In this project we will enable the external interrupt and we will turn On and Off the LED that is connected with RD0 pint of the PIC16F887 microcontroller, and the microcontroller operated with a 4MHz crystal. We will use the RB0 pin of the microcontroller that is external interrupt pin and we are using switch as the input device that will trigger the interrupt signal.

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