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Interfacing MT8816 with AT89C52

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I am interfacing switch MT8816(8x16 switch array) with microcontroller AT89C52. I am using port 3 of Microcontroller for generating addresses for switch. After switching when I check more than 1 phone lines are connected. Is it the fault in switch or microcontroller or some other issue. I have tried too much but I can't identify where the problem exists. If anyone having idea please try to solve the problem.
Thanks
 
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