Differentiate between subroutine calling and handling program interrupt??
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The interrupt is usually initiated by external or internal signal rather than from the execution of an instruction. (except for software interrupt) ... Subroutine call is called by the user through instructions, whereas Interrupt is called by the hardware or any external signal.
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1} Subroutine is a sequence of program instruction that perform a specific task.
subroutine may be called as procedure, a function, a method, a routine, or a subprogram.
2} Handling program is also known as interrupt handler. After the interrupting condition/ device have been serviced the execution of original program is resumed.
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