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Questions and Answers
Nonmaskable interrupts are denoted by the symbol NMI.
Nonmaskable interrupts are denoted by the symbol NMI.
True
Internal interrupts are triggered by internal signals and RESET.
Internal interrupts are triggered by internal signals and RESET.
False
There are up to 10 external hardware interrupts in a processor.
There are up to 10 external hardware interrupts in a processor.
False
The INT n instruction is used to trigger software interrupts.
The INT n instruction is used to trigger software interrupts.
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A processor suspends what it is doing in the main part of the program and continues to execute the current task.
A processor suspends what it is doing in the main part of the program and continues to execute the current task.
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There are six groups of interrupts in a processor.
There are six groups of interrupts in a processor.
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A processor cannot suspend what it is doing in the main part of the program.
A processor cannot suspend what it is doing in the main part of the program.
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The special routine that a processor passes control to is called the main program.
The special routine that a processor passes control to is called the main program.
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When a processor suspends what it is doing in the main part of the program, it passes control to the interrupt service routine.
When a processor suspends what it is doing in the main part of the program, it passes control to the interrupt service routine.
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The interrupt service routine is a part of the main program.
The interrupt service routine is a part of the main program.
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The NMI vectors are from type 1.
The NMI vectors are from type 1.
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On NMI input, the NMI flip-flop is reset.
On NMI input, the NMI flip-flop is reset.
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NMI type of interrupts can respond after a short delay.
NMI type of interrupts can respond after a short delay.
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Current flags, CS, and IP are pulled from the stack on NMI input.
Current flags, CS, and IP are pulled from the stack on NMI input.
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NMI input must be active for one clock cycle.
NMI input must be active for one clock cycle.
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The Status Register is an 8-bit register to hold indicator bits.
The Status Register is an 8-bit register to hold indicator bits.
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All bits in the Status Register are used.
All bits in the Status Register are used.
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The Status Register holds numeric values.
The Status Register holds numeric values.
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The Status Register is used to trigger interrupts.
The Status Register is used to trigger interrupts.
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The Status Register is a 16-bit register that holds both numeric and indicator bits.
The Status Register is a 16-bit register that holds both numeric and indicator bits.
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The INT n instruction initiates a software interrupt.
The INT n instruction initiates a software interrupt.
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Software interrupts have a lower priority than external interrupts.
Software interrupts have a lower priority than external interrupts.
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A processor can continue executing the main program when an interrupt occurs.
A processor can continue executing the main program when an interrupt occurs.
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The interrupt service routine is a separate program from the main program.
The interrupt service routine is a separate program from the main program.
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INT n is an external hardware interrupt.
INT n is an external hardware interrupt.
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Study Notes
Interrupts
- A processor suspends its current operation and passes control to a special routine called an Interrupt Service Routine (ISR).
- There are up to 256 interrupts, divided into five groups:
- External Hardware interrupts (INTR)
- Nonmaskable interrupts (NMI)
- Software interrupts (INT n instruction)
- Internal interrupts (Internal signals / TEST)
- Reset (RESET)
The Status Register
- A 16-bit register that holds indicator bits, not all of which are used.
- The Status Register is not an event in external hardware.
Software Interrupts
- INT n instruction initiates a software interrupt.
- Software interrupts have a higher priority than external interrupts.
Non-Maskable Interrupts
- NMI interrupts are triggered when the NMI input is set to 1 for two consecutive clock cycles.
- When an NMI interrupt occurs, the current flags, CS, and IP are pushed into the stack.
- NMI vectors are of type 2.
- NMI interrupts must be responded to immediately, such as in the case of power failure or memory-read error.
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Description
This quiz covers the basics of interrupts and the status register in computer organization. Understand how interrupts work and the different types of interrupts. Learn about the status register and its functions.
