Question: Question 7. (15 points) in many Interrupt Service Routine (ISR), the last instruction of an ISR is BX LR. For a regular subroutine return, BX

Question 7. (15 points) in many Interrupt Service Routine (ISR), the last instruction of an ISR is BX LR. For a regular subroutine return, BX LR simply puts LR into PC. For an interrupt return BX LR does something different. How does BX LR know not to put LR into PC, and instead what does BXLR do

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