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When devices interrupt occurs how does the processor determine which device issued the interrupt?
It's pretty simple. First, the processor must determine which interrupt occurred. On simple hardware setups, you may already know this just by which interrupt handler was called. On more complex hardware, you may have to read status registers in the interrupt controller. Second, the processor has to look up which devices are capable of asserting that interrupt. On simple hardware, generally there is only one device that can trigger each interrupt and this is determined by the way the device is wired. On more complex devices, this may be determined by software and the processor may have to consult tables that were created during the boot process. Third, the processor must determine which of those devices actually asserted the interrupt (if there's more than one). This is typically done by the driver for each device which generally just asks the device if it triggered an interrupt. Most devices have status registers that either directly tell you whether it caused an interrupt or tell you whether the device needs service which was the point of the interrupt anyway.
Should any device be allowed to interrupt CPU while another interrupts are being serviced?
It is possible to allow nested interrupts. This is often done when there is a heirarchy of interrupts, some with higher priority than others. In order for this to work, the second interrupt must not be allowed to influence the progress of the first interrupt. We call this being "thread safe". In a nested scheme, an interrupt mask is set so that higher priority interrupts can be permitted, while blocking interrupts of the same or lower priority, and then interrupts are reenabled during the interrupt service routine. At the conclusion of the first routine, interrupts are disabled again, the mask is restored, and the normal interrupt return sequence is executed. In the 8085, this can be supported using the Read Interrupt Mask (RIM) and Set Interrupt Mask (SIM) instructions. While not strictly required, the logical priority is often INTR, RST5.5, RST6.6, RST7.5, and then TRAP, in order of increasing priority.
What is interrupt management?
The computer "buss" is a "wide" communication device within each computer that allows transfer of data to different components. Obviously, some method must be employed to control what devices can transfer data at any given time. A device sets an "interrupt" flag when it has data to transfer and through interrupt management, each device is eventually given the opportunity to send data across the buss. Buss control is a complex issue and not one that can be adequately discussed in this type of a forum. Computer engineering courses cover the subject in much greater detail.
Which electrical device must have high resistance in order to function properly?
voltmeter
How do you un install a USB device?
In order to install USB device you must have a driver, USB installers can be obtained or included in some motherboard drivers.
How can I upgrade to iOS 5 if I do not have a computer?
You can't, but you must of had to have a computer in order to have any apple device. It is not yet possible to start a device with out a computer as of now.
What is software polling?
When the microprocessor receives an Interrupt Service Request (ISR) on the interrupt line it must determine which of the devices connected to that input sent the request.Software Polling is one method by which it can do so.In Software Polling:A software routine is used to identify the device requesting service. It does so by checking each device to see if it was the one needing service.
How do you upgrade Android 4.0 to Android 4.1?
Usually, in order to update your device from one version of Android to another, you must receive an update from your carrier or the device's manufacturer.
What happens when a CPU is interrupted?
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.
What are the rules to be followed by the interrupt routines in rtos?
1)an interrupt routine must not call any rtos function that bmight block the caller inthe future2)an interrupt routine may not call any rtos function that might cause rtos to switch task unless the rtos knows that an interrupt routine is not a task executive.
What is the process of light painting?
In order to light paint, one must have a camera that has a setting to set exposure time. Then a light source must be used on a long exposure picture.
What is a Sentence Interruption?
I finally found a place to do my homework without interruption from my roommates.
