Interfacing Atmega32 with 74157 MUX

[nauman_mrd]

Dear Friends
i am interfacing GSM Module Sim 900 and GPS Module Holux M89 with Atmega32A using 74157 Multiplexer and select pin of Mux is connected with pin 16 of Atmega32A. The Problem is that Mux is not passing gps and gsm data to microcontroller. i have checked the continuity of traces all are ok. a proper voltage 4.9 is avaliable on MUX select pin when high Enable of MUX is connected with GND. VCC connected to MUX is 4.9V.

Can anybody help me ?

 

[jayanth.devarayanadurga]

The Problem is that Mux is passing gps and gsm data to microcontroller.

MUX should not pass data to uC?

 

[nauman_mrd]

MUX should not pass data to uC?

Sorry brother i forgot the word not there.

Mux is not passing gps and gsm data to micro controller.