What happens if a new interrupt requestoccurs with a lower priority than a previousrequest with an ISR currently running?1) The ISR for the new request runs when thecurrent ISR is done2.) The ISR for new request will run rightaway and the current ISR is terminated3.) It depends on how long the current ISRhas been running4.) The current ISR will "suspend" until thenew ISR has completed.

Answered: What happens if a new interrupt request…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Suppose, you need to service 36 interrupts. At least how many slave-8259chips do you need to fulfil this requirement? Again, let, you need one more interrupt to servicealongside the above 36. Would you need more slave-8259? Explain shortly.
The FIQ interrupt methods are required to establish a connection and succession at the designated offset within the Interrupt Vector Table. It.?
3. An external event is sensed using polling with period P. It takes 100 cycles to processthe event. Processor frequency is 48 MHz. Before starting a new period, the previouspolling task should have finished. The relative deadline for processing an event is 10μs.(a) Determine the range of feasible polling periods? (b) Suppose now that an unrelated interrupt may occur and the interrupt has higher priority than the code for processing the polling event. Including all overhead, it takes 40 cycles to process the interrupt. The minimum time between two subsequent interrupts is T. Suppose that T is larger than 140 cycles. Determine the range of feasible polling periods.
Task 1: Write a program using both external interrupt and PORTB interrupt to adjust a PWM signal. Connections: Two buttons at RB0 and RB4. One LED at RA1 Concept: There are two delay loops named t_up and t_down. Their total is always constant T. Main program: Star with t_up = t_down. In an infinite loop, turn on the LED and wait for t_up, turn off LED and wait for t_down. External Interrupt: Increase t_up by 10% of T. If t_up is 100% of T don’t increase. PORTB Interrupt: Decrease t_up by 10% of T. If t_up is 0% of T don’t decrease. Report: It can be written on paper or on a computer (I prefer it to be written on a computer). The report will include: Student Name, Surname, and ID. Write button functions. Flowchart of the software. Assembly Code. (Any line of C code will result in a 0 grade for the paper)
When hooking and chaining FIQ interrupt operations, you need to employ an offset called an Interrupt Vector Table (IVT). It.?
FIQ interrupt methods must hook and chain at the Interrupt Vector Table offset. It.?
What is the difference (in Motorola terminology) handling? 2. What is the difference between a vectored and an autovectored interrupt? Under what circumstances are autovectored interrupts employed in 68k base system? 3. What is a spurious interrupt and how is it generated? 4. What is the difference between an uninitialized interrupt and a spurious interrupt exception?
Answer the following:I. Name any two interrupt/exceptions that can occur during IF and ID stagesII. Contrast superscalar and superpipelined modes of ILPIII. What is the role of write back buffers in write-through and write-back cachesIV. What is the impact of prefetcher on the different kinds of cache missesV. Illustrate why and what kind of hazards are addressed/not-addressed by registerrenaming
Write a program that generates TMR0 interrupt signal every 65.5msec. (oscillator frequency is 4MHz) Also handle the interrupt and the interrupt subroutine properly. WDT is a timer, and it has a separate built-in low power oscillator. Its main purpose is to reset the program at overflow. On reset, the program starts from the beginning. Also, by resetting it can wake up a sleeping MC. When a wakeup happens, the program continues from last CLRWDT command. In program WDT can be cleared using CLRWDT command. Pre-Scale Value (PSV) is also applicable to WDT as shown in the datasheet. When PSV is 000 from CLRWDT to overflow WDT takes 18ms. For WDT to work, WDT must be turned on at configurations. When in sleep mode the Micro Processor (MC) stops most of its processes to minimize power consumption. It is important for battery-powered systems. Command SLEEP is to make MC enter Sleep Mode. There are three ways to exit a sleep mode: Manual Reset, External Interrupt Trigger (INTF becomes 1),…
Consider the following scenario:a main program starts execution at time t = 03 second later device B sends interrupt signal5 second later device A sends interrupt signal2 second later device E sends interrupt signal3 second later device C sends interrupt signal5 second later device D sends interrupt signal5 second later device F sends interrupt signalhighlight on the following figure the paths of execution that realize the mentioned interrupt scenario.With each highlighted path indicate time value (t = ?)Finally draw one more path from the last ISR executed back to the main program and displayreturn time.
7. The method of synchronising the processor with the I/O device in which the device sends a signal when it is ready is a. Exceptions b. Signal handling c. Interrupts d. DMA
A process may be stopped dead in its tracks by using the "Interrupt" or "Traps" keyword.Explain both the Interrupt and Trap mechanics, as well as the distinctions between the two.

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