CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged.

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CPU as two modes privileged and non-privileged. In order to change the mode from privileged to non-privileged.

1. A hardware interrupt is needed

2.A software interrupt is needed

3.Either hardware or software interrupt is needed

4. A non-privileged instruction (which does not generate an interrupt)is needed

Posted Date:-2021-03-15 06:07:33

More MCQS Questions and answers

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  11.  The interrupt servicing mechanism in which the requesting device identifies itself to the processor to be serviced is ___________
  12.  The method of accessing the I/O devices by repeatedly checking the status flags is ___________
  13.  The return address from the interrupt-service routine is stored on the ___________
  14.  The starting address sent by the device in vectored interrupt is called as __________
  15.  To overcome the lag in the operating speeds of the I/O device and the processor we use ___________
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  23. In memory-mapped I/O ____________
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  25. The advantage of I/O mapped devices to memory mapped is _________
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  31. The method of synchronising the processor with the I/O device in which the device sends a signal when it is ready is?
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  33. The process wherein the processor constantly checks the status flags is called as ___________
  34. The processor indicates to the devices that it is ready to receive interrupts ________
  35. The program used to find out errors is called __________
  36. The resistor which is attached to the service line is called _____
  37. The signal sent to the device from the processor to the device after receiving an interrupt is _______
  38. The system is notified of a read or write operation by ___________
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  40. The two facilities provided by the debugger is __________
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