ISR meaning in Information Technology ?

Answer:

What is Interrupt Service Routine mean?

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. Hardware interrupts arise from electrical conditions or low-level protocols implemented in digital logic, are usually dispatched via a hard-coded table of interrupt vectors, asynchronously to the normal execution stream (as interrupt masking levels permit), often using a separate stack, and automatically entering into a different execution context (privilege level) for the duration of the interrupt handler's execution. In general, hardware interrupts and their handlers are used to handle high-priority conditions that require the interruption of the current code the processor is executing.

Later it was found convenient for software to be able to trigger the same mechanism by means of a software interrupt (a form of synchronous interrupt). Rather than using a hard-coded interrupt dispatch table at the hardware level, software interrupts are often implemented at the operating system level as a form of callback function.

Interrupt handlers have a multitude of functions, which vary based on what triggered the interrupt and the speed at which the interrupt handler completes its task. For example, pressing a key on a computer keyboard, or moving the mouse, triggers interrupts that call interrupt handlers which read the key, or the mouse's position, and copy the associated information into the computer's memory.

An interrupt handler is a low-level counterpart of event handlers. However, interrupt handlers have an unusual execution context, many harsh constraints in time and space, and their intrinsically asynchronous nature makes them notoriously difficult to debug by standard practice (reproducible test cases generally don't exist), thus demanding a specialized skillset—an important subset of system programming—of software engineers who engage at the hardware interrupt layer.

reference

Full Form	Category
Information Skills Resource	Academic & Science
Ice Sheet Reconstruction	Academic & Science
Information Systems Research	Academic & Science
Institute for Scripture Research	Academic & Science
Industry Standard Research	Academic & Science
Intelligence and Space Research	Academic & Science
Institute for Sensory Research	Academic & Science
International Society of Radiology	Academic & Science
Individualised Student Record	Academic & Science
Invoice Summary Register	Business
International Sovereign Energy Corporation	Business
Institutional Social Responsibility	Community
International Schools Review	Community
In School Restriction	Community
Interrupt Space Register	Computer Assembly Language
Interrupt Segment Register	Computer Assembly Language
Internet Service Router	Computer Hardware
Information Storage and Retrieval	Computing
Intermediate Session Routing	Computing
Integrated Services Router	Computing
Instruction Sampling Recording	Computing
Ideal Software Radio	Computing
Interrupt Status Register	Computing
Iterative Survivable Routing	Computing
Information Security Regulation	Computing
Internet Security Report	Computing
Intermediate Segregation Regime	Computing
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Insureum	Cryptocurrency
In-situ Rinse	Electronics
Integrated Surveillance Resourse	General
International Sportscar Racing	General
Illegal Street Racing	General
Independent Shifting Rod	General
Inventory Stock Records	General
Independent Sales Representative	General
Individual Support And Retention	General
The Indexing Service Reference	General
Intelligence Surveillance Reconnaissance	General
itial State Radiation	General
Interdepartmental Service Request	General
Integrity Service Results	General
Ice Speed Record	General
Intelligence Surviellance and Reconnaissance	General
Integrated Services Routers	General
Institutetute for Social Research	General
Interrupt In Service Register	General
Integrally Suppressed Rifle	General
In Stent Restenosis	General
Induced Systemic Resistance	General
In Situ Recovery	General
Interrupt Service Register	General
Intersecting Storage Rings	General
Inventory Sales Ratio	General
Indirect Source Review	General
Intercept Stabilize And Resolve	General
Individual Safety Report	Governmental
Institute for Social Research	Governmental
Institute for Survey Research	Governmental
Institute for Systems Research	Governmental
Institute for Scientific Research	Governmental
Illegal Street Racer	Governmental
International Socialist Review	Governmental
Institute of Seismological Research	Gujrat Government
Interrupt Service Routine	Information Technology
International Services Repair	International
Impuesto Sobre la Renta	International
Inside Sales Representative	Jobs
Invasive Surgery Remix	Medical
Intelligence, Surveillance, and Reconnaissance	Military and Defence
Installation Status Report	Military and Defence
Individual Soldier Radio	Military and Defence
Integrated Services Router (cisco)	Networking
Integrated Switch Router	Networking
Initial State Radiation	Physics Related
Iowa Southern Railroad Company	Regional
Iowa Southern Railroad	Regional
Institute for Software Research	Softwares
Incremental Software Release	Softwares
Initial System Release	Space Science
International Sports Relations	Sports
International Snowmobile Racing	Sports
Infant Swimming Resource	Sports
Infant Swimming Resource's	Sports