Lecture

Understanding Microcontroller Interruptions

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Description

This lecture covers the concept of interruptions in microcontrollers, explaining the various types such as External Pin, Power-on Reset, and Watchdog Reset. It delves into interrupt vectors, interrupt service routines, and different interrupt categories like External Int and Timers. The lecture also discusses interrupt handling in specific microcontroller models like ATmega328P, highlighting the interrupt definition and setup using examples. Additionally, it explores the difference between Polling and Interruption, emphasizing the internal complexity and ease of programming. The content is illustrated with tables, program addresses, and code snippets for practical understanding.

Official source

Ontological neighbourhood

Computer engineering

High-performance computing: Real-time computing

Related concepts (26)

Interrupt handler

In computer systems programming, an interrupt handler, also known as an interrupt service routine or ISR, is a special block of code associated with a specific interrupt condition. Interrupt handlers are initiated by hardware interrupts, software interrupt instructions, or software exceptions, and are used for implementing device drivers or transitions between protected modes of operation, such as system calls. The traditional form of interrupt handler is the hardware interrupt handler.

Interrupt

In digital computers, an interrupt (sometimes referred to as a trap) is a request for the processor to interrupt currently executing code (when permitted), so that the event can be processed in a timely manner. If the request is accepted, the processor will suspend its current activities, save its state, and execute a function called an interrupt handler (or an interrupt service routine, ISR) to deal with the event.

Interrupt latency

In computing, interrupt latency refers to the delay between the start of an Interrupt Request (IRQ) and the start of the respective Interrupt Service Routine (ISR). For many operating systems, devices are serviced as soon as the device's interrupt handler is executed. Interrupt latency may be affected by microprocessor design, interrupt controllers, interrupt masking, and the operating system's (OS) interrupt handling methods. There is usually a trade-off between interrupt latency, throughput, and processor utilization.

Non-maskable interrupt

In computing, a non-maskable interrupt (NMI) is a hardware interrupt that standard interrupt-masking techniques in the system cannot ignore. It typically occurs to signal attention for non-recoverable hardware errors. Some NMIs may be masked, but only by using proprietary methods specific to the particular NMI. An NMI is often used when response time is critical or when an interrupt should never be disabled during normal system operation.

Interrupt request

In a computer, an interrupt request (or IRQ) is a hardware signal sent to the processor that temporarily stops a running program and allows a special program, an interrupt handler, to run instead. Hardware interrupts are used to handle events such as receiving data from a modem or network card, key presses, or mouse movements. Interrupt lines are often identified by an index with the format of IRQ followed by a number. For example, on the Intel 8259 family of programmable interrupt controllers (PICs) there are eight interrupt inputs commonly referred to as IRQ0 through IRQ7.

Related lectures (63)

Timers and Counters: Architecture and Applications

Explores the architecture and applications of timers and counters in microcontrollers for generating precise time bases and signals.

Playing Melodies: Timer & Interruption

Explains playing melodies using timers and interruptions on microcontrollers, covering notes, periods, durations, and sensor implementation.

Understanding Microcontrollers: Programming in C/Arduino

Covers the basics of programming microcontrollers using C language and Arduino platform.

Microcontrollers Fundamentals

Covers microcontrollers fundamentals, including operations, pointers, interrupts, and interrupt handling.

Programming for Engineer: Introduction