slow return from subrutine

[mister_e]

what about

setup: ; entra en la configuracion de la circunferencia
     INTCON.7=0 'disable all interrupt
     WHILE portb.2 

          x = circunferencia
          for demora = 1 to 20
               gosub display
          next


          if portb.3 = 0 then
               circunferencia = circunferencia + 1
               if circunferencia > 215 then 'lets say its=216
                    circunferencia = 0
               endif
          endif

     WEND
     INTCON.2=0
     INTCON.1=0
     INTCON.7=1 'enable all interrupt

     return

and what about if you rename setup to Mysetup? timer to MyTimer?

Redefine all your math variable to WORD size can also do something. Case not, i'll try it on-board. Looks weird.

Could you axplain, brief, how your hardware/software is suppose to work? And if you can provide some schematic too it can be handy.