List the shadow registers in various interrupt modes. What are the main differen

Question

List the shadow registers in various interrupt modes. What are the main difference between normal subroutine calls and interrupt routine calls? In The Nested Vectored Interrupt Controller (NVIC) offers very fast interrupt handling and provides the vector table as a set of real vectors (addresses). Is the following statement correct? List the interrupt handler names defined for the following interrupts in NVIC. System timer ADC interrupt USARTI interrupt In the following program, how long (in ms) does it take for msTicks to increase by one? Assume the internal clock 8Mhz is used. State how to enable an interrupt by a NVIC function. What is the difference between the following two statements? NVIC ISER [1] = (1

Explanation / Answer

1-

Shadow registers are basically used to minimize register load/memory overhead in dealing with interrupts. An interrupt to which set of shadow register is provided , In the entry section of interrupt handler it   does not need to save any context in the memory to provide free registers or load any interrupt-specific data stored in provided shadow registers.

At the exit section of the interrupt handler there is proper restoring of previous context is carried out and there is no saving of the interrupt handler context.

There are some special extension that are used to extends the use of shadow register sets to become thread contexts..

2-

Basically a normal subroutine deal with the code you write and call as per the requirement, In contrast interrupt routine calls is basically system bounded calls and user doesnot have any access on these calls ,Interrupt subroutine calls deals with the scenario where there is immediate attention are required .So Basically Interrupt subroutine runs when there is certain signal generated by software or hardware .

So, The huge difference between normal subroutine and ,Interrupt subroutine is that you have the knowledge where the subroutine runs as its call depend on you . But the user doesn't know about execution of Interrupt subroutine.

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