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ISR (INTERRUPT SERVICE ROTUINE )... PROBLEM WITH 89C51

above give attachment ... is of multisim 11 file..in that.......when we execute program of mcu ...1st cycle works properly... when we disable interrupt it and use that pin as i/p pin key...and by pressing that..our program...ends........and once again ready for second vehicle......(means starting frm head...) at that time when we enble interrupt.... ----dont know y..controller executes there isr...though there is no interrupt call........

waiting for solution.... ans

if any query in question pls contact on....rus15hit@yahoo.com(rushit parekh-9426317847)