Q40.Marks: +2.0UGC NET Paper 2: Computer Science 26th Nov 2021
Given below are three statements related to interrupt handling mechanism
A. Interrupt handler routine is not stored at a fixed address in the memory.
B. CPU hardware has a dedicated wire called the interrupt request line used for handling interrupts
C. Interrupt vector contains the memory addresses for speciaized interrupt handlers.
In the context of above statements, choose the correct answer from the options given below :
1.A is TRUE only
2.Both B and C are TRUE only✓ Correct
3.Both A and B are TRUE only
4.Both A, C are TRUE only
Solution
Interrupt handler routine is not stored at a fixed address in the memory: FALSE
For every interrupt, there must be interrupt handler. When an interrupt occurs, the microcontroller runs the interrupt service routine. For every interrupt, there is a fixed location in memory that holds the address of its interrupt service routine
CPU hardware has a dedicated wire called the interrupt request line used for handling interrupts: TRUE
The CPU hardware has a wire called the interrupt request line which is sensed by CPU after executing every instruction. When the CPU detects that a controller has asserted a signal on the interrupt request line, the CPU performs a state save and jumps to the interrupt handler routine at a fixed address in memory.
Interrupt vector contains the memory addresses for specialised interrupt handlers: TRUE
An interrupt vector is the memory location of an interrupt handler, which prioritizes interrupts and saves them in a queue if more than one interrupt is waiting to be handled.