Processor serves the interrupt request after completing the execution of the current instruction.

The Processor executes the Current Instruction and then Stores the address of the Next instruction to be Executed in the same function .
Then services the Interupt and Come back to the Function where fetches the previously Stored Address and start executing it.

Ex:
main()
{
int a,b,c;
//interrupt has occured here
//PC is here
Sum = a+b;//Address 0x1c00
// Execute the Instruction
////Store 0x1c01 in teh Stack
//service the interrupt
//restore Pc = 0x1c01
//execution follows
Subtract = a-b;//Address 0x1c01
Product = a*b;//Address 0x1c02

Processor serves the interrupt request after completing the execution of the current instruction.

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