Microprocessor
The interrupt facility is provided in microprocessor to

 stop the microprocessor when desired
 keep a control on the working of the microprocessor
 stop the microprocessor when it starts malfunctioning
 change the sequence of the instructions being executed

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Microprocessor
FPGA means

 Forward Programmable Gate Array
 Field Programmable Gate Array
 Field Parallel Gate Array
 Forward Parallel Gate Array

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Microprocessor
When RET instruction is executed by any subroutine then

 the top of the stack will be popped out and assigned to the PC.
 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.

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