Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Which of the following is true?a)Unless enabl...
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Which of the following is true?
- a)Unless enabled, a CPU will not be able to process interrupts.
- b)Loop instructions cannot be interrupted till they complete.
- c)A processor checks for interrupts before executing a new instruction.
- d)Only level triggered interrupts are possible on microprocessors.
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which of the following is true?a)Unless enabled, a CPU will not be abl...
Ans is A.
Options B and D is obviously false.
A processor checks for the interrupt before FETCHING an instruction, So Option C is also false.
Options B and D is obviously false.
A processor checks for the interrupt before FETCHING an instruction, So Option C is also false.
Most Upvoted Answer
Which of the following is true?a)Unless enabled, a CPU will not be abl...
CPU and Interrupts
CPU or Central Processing Unit is the brain of a computer system that executes instructions stored in memory. Interrupts are signals that are sent to the CPU by external devices or internal processes to get its attention. When an interrupt occurs, the CPU suspends its current task and executes a specific routine called an interrupt handler to handle the interrupt.
Enabled Interrupts
An enabled interrupt means that the CPU is set to receive and process interrupts. If interrupts are not enabled, the CPU will not be able to process any interrupt signal. Enabling interrupts is necessary for the CPU to respond to external events like keyboard input, mouse movements, or disk I/O operations.
Loop Instructions
Loop instructions are a type of instruction that repeats a set of instructions until a specific condition is met. Loop instructions cannot be interrupted until they complete their task. Therefore, it is important to design these instructions carefully to avoid any critical issues.
Checking Interrupts
Before executing a new instruction, a processor checks for the presence of any pending interrupts. If there is any interrupt pending, the processor suspends the current task and executes the interrupt handler. After executing the interrupt handler, the processor resumes its previous task.
Level Triggered Interrupts
Level triggered interrupts are a type of interrupt that remains active as long as the interrupt signal is present. In contrast, edge-triggered interrupts are active only for a brief moment when the signal changes from low to high or high to low. Most modern microprocessors support both level and edge-triggered interrupts.
Conclusion
In summary, enabling interrupts is necessary for the CPU to process external events, loop instructions cannot be interrupted till they complete, processors check for interrupts before executing a new instruction, and both level and edge-triggered interrupts are possible on microprocessors.
CPU or Central Processing Unit is the brain of a computer system that executes instructions stored in memory. Interrupts are signals that are sent to the CPU by external devices or internal processes to get its attention. When an interrupt occurs, the CPU suspends its current task and executes a specific routine called an interrupt handler to handle the interrupt.
Enabled Interrupts
An enabled interrupt means that the CPU is set to receive and process interrupts. If interrupts are not enabled, the CPU will not be able to process any interrupt signal. Enabling interrupts is necessary for the CPU to respond to external events like keyboard input, mouse movements, or disk I/O operations.
Loop Instructions
Loop instructions are a type of instruction that repeats a set of instructions until a specific condition is met. Loop instructions cannot be interrupted until they complete their task. Therefore, it is important to design these instructions carefully to avoid any critical issues.
Checking Interrupts
Before executing a new instruction, a processor checks for the presence of any pending interrupts. If there is any interrupt pending, the processor suspends the current task and executes the interrupt handler. After executing the interrupt handler, the processor resumes its previous task.
Level Triggered Interrupts
Level triggered interrupts are a type of interrupt that remains active as long as the interrupt signal is present. In contrast, edge-triggered interrupts are active only for a brief moment when the signal changes from low to high or high to low. Most modern microprocessors support both level and edge-triggered interrupts.
Conclusion
In summary, enabling interrupts is necessary for the CPU to process external events, loop instructions cannot be interrupted till they complete, processors check for interrupts before executing a new instruction, and both level and edge-triggered interrupts are possible on microprocessors.
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