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When the processor under execution is interrupted by a non-maskable interrupt it serves?
When a processor is interrupted by a non-maskable interrupt (NMI), it immediately suspends the current execution and transfers control to a predefined interrupt service routine (ISR) designed to handle the interrupt. This type of interrupt cannot be ignored or masked, ensuring that critical tasks, such as hardware failures or system errors, are addressed promptly. Once the ISR is executed, the processor typically resumes its previous task, restoring the state before the interruption. This mechanism allows for quick responses to urgent system conditions while maintaining overall system stability.
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What action is taken when the processor under execution is interrupted by TRAP in 8085MPU?
Processor serves the interrupt request after completing the execution of the current instruction.
What will do processor by an interrupt pending?
When an interrupt is pending, the processor will temporarily halt its current execution to address the interrupt signal. It saves the state of the current process, including the program counter and registers, to ensure that it can resume later. The processor then jumps to the interrupt service routine (ISR) associated with the interrupt to handle the specific event. Once the ISR completes, the processor restores the saved state and resumes the interrupted process.
How ISR is serviced?
when interrupt occurs, the program counter content will stores into stack, an PC will load interrupt address for next instruction execution. ofter completion ISR process PC will retrieves the stack values and execution will be continued.
How 8086 responds to an interrupt?
When the 8086 microprocessor receives an interrupt signal, it completes the execution of the current instruction and saves the address of the next instruction onto the stack. It then determines the appropriate interrupt vector from the Interrupt Vector Table (IVT) based on the interrupt type. The processor then transfers control to the interrupt service routine (ISR) associated with that interrupt. After the ISR has executed, the 8086 retrieves the saved address from the stack and resumes execution from where it was interrupted.
How long can the INTR signal stay high?
The INTR pulse can remain high until the interrupt flip-flop is set by the EI instruction in the service routine. If it remains high after the execution of the EI instruction, the processor will be interrupted again, as if it were a new interrupt.
What is the use of interrupt vector?
An interrupt vector is the memory address of an interrupt handler, or an index into an array called an interrupt vector table or dispatch table. Interrupt vector tables contain the memory addresses of interrupt handlers. When an interrupt is generated, the processor saves its execution state via a context switch, and begins execution of the interrupt handler at the interrupt vector.
What happens when halt instruction is executed?
The processor stops and goes to the halt state. If an interrupt occurs, it responds and then continues execution.
What is difference between vectored and non vectored interrupts?
Vector interrupt --> when processor directly call the respective isr when interrupt occurs so, address of respective isr is usually save in register. Non interrupt Vector --> In this case when interrupt occurs the processor calls a generic isr and in generic isr uaer has to call respective isr by checking status register.
What is interrupt vector?
When a processor is interrupted to do a particular task,Program counter should be loaded with the the address of subroutine(task).If the processor automatically generates the address then it is known as vectored interrupt.for example if 8085 microprocessor is interrupted through RST 5.5 pin,then processor multiplies 5.5 by 8 and converts it to Hex address.If user has to provide address of subroutine using CALL instruction then it is known as non vectored interrupt
What causes an interrupt handler to run?
An interrupt handler runs in response to an interrupt signal generated by hardware or software events, such as input from a keyboard, mouse, or network device. When an interrupt occurs, the processor temporarily halts its current execution, saves its state, and transfers control to the designated interrupt handler, which addresses the specific event. Once the handler completes its task, the processor can resume its previous operations. This mechanism allows systems to respond promptly to asynchronous events.
Why is the INTR input automatically disabled as a part of the response to an INTR interrupt?
The INTR input is automatically disabled in response to an INTR interrupt to prevent the processor from being interrupted by additional INTR requests while it is already handling the current interrupt. This mechanism ensures that the system maintains stability and consistency during interrupt processing, allowing the CPU to complete its current task without being preempted. By disabling the INTR input, the processor can focus on servicing the interrupt without the risk of losing or mismanaging subsequent interrupts.
How are multiple interrupts dealt with?
There are 2 approaches to handle this situation,1.Disable interrupts while an interrupt is being processingin this approach, when the processor is being processing an interrupt, the processor ignores any new interrupt signal and these new signals have to wait in a queue and processor will check after the currently processing interrupt is finished.2. Defining priorities for interruptsin this case, each interrupt has a priority value. When the processor is being executing an interrupt, another interrupt can interrupt and gain the processor if the second interrupt has a higher priority than first oneSource- William Stallings, operating systems Sorry, the word you are looking for is not in the Database
