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A section of code to which control is transferred when a processor is interrupted is known as
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Whenever there is an interrupt to the sequential instruction execution then the processors loads its program counter with the starting location of a routine which contains code to execute the interrupt. This location where the part of code is stored is called interrupt service routine (ISR). The processor executes the ISR and returns to the next instruction of the main program.
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In system programming, an interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention. ... Hardware interrupts are used by devices to communicate that they require attention from the operating system.