In The Nested Vectored Interrupt Controller (NVIC) offers very fast interrupt ha

Question

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?

“ the NVIC automatically saves and restores a set of the CPU registers (R0-R3, R12, PC, PSR, and LR), does a quick entry to the next pending interrupt without a complete pop/push sequence, and serves a complete set of 255 (240 external) interrupts.”

List the interrupt handler names defined for the following interrupts in NVIC.

System timer

ADC interrupt

USART1 interrupt

Explanation / Answer

1) NVIC is purposed for minimizing the Latency in Exception handling and Interrupt handling.

2) NVIC implements System Control Registers.

3) NVIC provides better power management and recovery methods.

4) Interrupt vector table is accessible Randomly with Interrupt Vector Address with reduced latency.

5) It prioratizes the interrupts up to 240 dynamically reprioritizable interrupts each with up to 256 levels of priority

which is useful in Masking and Unmasking the vector addresses.

6) Working of NVIC is similar to the statement provided in the provlem statement.Saving the previous register contex(Register File) ,Loading the new high priority Interrupt , Interrupt handling(ISR) , Reloading the previous Interrupt routines.

Hence Nested Vectored Interrupt Controller (NVIC) offers very fast interrupt handling and provides the vector table as a set of real vectors.

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1) Interrupt handler name for system timer : SysTick Interrupt Handler.

SysTick can be polled using software or configured to generate interrupt.

2) Interrupt handler name for ADC Interrupt : GPIO Handler.

3) Interrupt handler name for USART1 interrupt :

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