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interrupt stops interrupting

Myself and my partner have written a program
to interface keypad(4x4)&lcd to a targetboard
(c8051) and also we have written a subroutine
to realise a realtime clock using timer3 interrupt.
The problem is the clock runs only when the program
control is in main once another function is called
from main,the clock halts.Can somebody help me out.

regards
gayathri

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