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When a CPU receives an Interrupt Request (IRQ), it first checks if it must react to the interrupt. So-called Maskable Interrupts allow a programmer to specify that the CPU does ignore it, while Non-Maskeable Interrupt requests must be serviced.
It is important to note that an Interrupt is a way to communicate asynchronously with the CPU - very much like sending an email.
When you send an email to a person, you cannot know at which time the person reads the message, let alone when the person reacts.
A phone call, on the other hand is synchronous (happening at the same time): when I call you, you must answer right now.
Interrupts where introduced to allow tgis email-like communication with slower hardware, like a hard-disk. This way, the CPU can order something from the HD, like "go to this location", the CPU can then return to more important stuff, while the HD seeks. When the HD is done, it sends the CPU an IRQ, which tells the CPU "I am done, talk to me".
The CPU then does a so-called contex-switch, which is a rather costly operation: it must store all the data it was working on earlier in some secure way, normally on the stack and then begin to execute the so-called Interrupt Handler, a piece of software associated with the number of the IRQ.
After executing it, it can carry on doing what it did earlier (after having loaded all the data back into its registers).
The concept of IRQs make multi-tasking possible, here, the OS interrupts each process after its time-slice has expired.
Wiki User
∙ 15y ago
Wiki User
∙ 15y agoSeveral devices "hang" on the bus(meaning that they have connectivity). Each has it's own interrupt address.
When a device has information or a state that the processor needs to deal with, the device sets it's interrupt flag, the processor finishes what it's doing then the interrupt is "handled" in a way that is consistent with the requirements of the interrupting device.
Wiki User
∙ 9y agoWhen CPU receives and interrupts it currently stops the program execution and responds to the interruption. Once the interrupt is cleared, then it returns to the main program.
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When does background processing occur?
In computing, background processing happens when the CPU (CPU's) have spare capacity from on demand requirements and can perform tasks without affecting the response time of the user.
What happens when a program is running?
It consumes your memory space in primary memory and can manipulate and create files on the system. Also it is being executed by the CPU so it further consumes the CPU time
What is the CPU temperature range?
The Cpu Temperature is The Maximum/Minimum temperature of Cpu, You have to be inside these limits for your Cpu Safety
Why does your computer shut down when playing Zynga poker?
Overheating issue. Open your cabinet and clean the heatsink with a blower or a small brush to clear the dust. If it still happens, install a larger heatsink and/or a CPU cooler fan. Use SpeedFan to monitor your CPU temp.
What is the purpose of the CPU in computer?
CPU stands for central processing unit. As the name implies, the CPU processes everything the computer does and handles everything that goes on in a computer. The CPU is often referred to as the brain of the computer since everything goes through the CPU first. The purpose of the CPU is to read machine language and do what it is told by it. The machine code are the directions on what the CPU should do, but the CPU is needed in order to read this code.
Why DMA access to main memory is given higher priority than processor access to main memory?
In a DMA while the data is transferred between the memory and the device, if it is stopped or interrupted by any other device like CPU, it would result into a Data loss, since DMA doesnt have a program counter unlike CPU which stores it current position. In CPU if it is interrupted, it suspends it s operation without any data loss. Hence DMA has a higher priority than CPU.
What happens to data in CPU?
you should on the computer
Difference between preemptive and non preemptive system.with example?
Preemptive scheduling allows a process to be interrupted in the midst of its execution, taking the CPU away and allocating it to another process.Non-preemptive scheduling ensures that a process relinquishes control of the CPU only when it finishes with its current CPU burst.
What happens when a chemical change does not go through completion?
The chemical reaction is interrupted.
What happens when an electric current is interupted?
When the circuit is interrupted, the current stops flowing.
What happens to the data in the CPU?
goes into the computer's hardware.
What happens after the CPU activates the bios?
The POST runs
What happens in a series circuit if a light blows?
The circuit current is interrupted and all the lights will go out.
What is correct will not be interrupted or will be not interrupted?
Will not be interrupted is correct
What happens if you spray dust remover in your CPU?
It reluctantly moves and then shuts off
What is the episode when frasier is interrupted before a date by martin niles and daphne?
there are about 50 episodes that, that happens you have to explain more
When the mouse initiates a hardware interrupt to the CPU how does the CPU know?
The CPU does not "know" it is not a thinking being. What happens is that the interrupt flag ( a binary true or false register) is detected by the operating system which is being executed by the CPU and the code of the operating system runs a routine in response.
