Question

Difference between branch instruction call subroutine and program interrupt

Answer 1

Call Subroutine instructions

• Subroutine call is called by the user through instructions.

Program interrupt

• Interrupts are a commonly used technique for computer multitasking, especially in real-time computing.

• An act of interrupting is referred to as an interrupt request ("IRQ").

• Interrupt is called by the hardware or any external signal.

Branch instruction:

• Every time it is not possible to use line-sequence of instruction, sometime we need breakup in our program according to some condition this is nothing but branching. To perform these branching we require some instruction that is called branch instruction .

• If a branch is not taken, the flow of control is unchanged and the next instruction to be executed is the instruction immediately following the current instruction in memory; if taken, the next instruction to be executed is an instruction at some other place in memory.

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Answer 2

Difference between branch instruction call subroutine and program interrupt is as follows:

• There are some major differences between subroutine call and program interrupt:

• Subroutine can be called anytime by the user, but interrupts are system dependent.

• Subroutine call can be identified, as it is generally by the user, but there is no way to know when program interrupt might occur.

• Subroutine isn't dependent on the hardware, but interrupt occurs when a certain asynchronous signal comes from the hardware.