Explain what is going on? What is an external interrupt? What do they mean by active low? What is FIQ and IRQ? Was this answer helpful?The ARM processor has two levels of external interrupt, FIQ and IRQ, both of which are level-sensitiveactive LOW signals into the processor. For an interrupt to be taken, the appropriate disable bit in the CPSRmust be clear. ... FIQS are handled first when multiple interrupts occur.In the event of an interrupt, the source of the interrupt (like a Timer, Counter etc.) sends a special requestto the processor called Interrupt Request (IRQ) in order to run a special piece of code.Interrupt Related Registers in LPC2148.example of exceptions the state of resetting ARM core, the failure of fetching instructions or memoryaccess, when an external interrupt is raised or when a software interrupt instruction is executed. There isalways software associated with each exception, this software is called exception handler.

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What is an external interrupt? What do they mean by active low? What is FIQ and IRQ

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Explain what is going on? What is an external interrupt? What do they mean by active low? What is FIQ and IRQ?

Was this answer helpful?
The ARM processor has two levels of external interrupt, FIQ and IRQ, both of which are level-sensitive
active LOW signals into the processor. For an interrupt to be taken, the appropriate disable bit in the CPSR
must be clear. ... FIQS are handled first when multiple interrupts occur.
In the event of an interrupt, the source of the interrupt (like a Timer, Counter etc.) sends a special request
to the processor called Interrupt Request (IRQ) in order to run a special piece of code.
Interrupt Related Registers in LPC2148.
example of exceptions the state of resetting ARM core, the failure of fetching instructions or memory
access, when an external interrupt is raised or when a software interrupt instruction is executed. There is
always software associated with each exception, this software is called exception handler.

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