Regardless of the fact that you CAN do complex operations within ISRs, its not good practice. ISRs are for handling time-critical events where you must have a response to some outside event within a few processor cycles. But all other code, like maths, display handling, and any other stuff which takes a long time or ties up mulitple registers, should be handled in the main loop. Where you must respond to an event in an ISR with some complex operation, just set a flag to tell the main loop the ISR has occurred, then handle it in main ( and dont forget to clear the flag ! ).
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