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    UART and MUX, DEMUX use Control Reg for some RX input and TX ouput


       Hi Everyone. I have a poject use Uart and Control.


      My Uart have 3 input RX,  RX - GPS, RX- LCD,  RX- GSM; and 3 output for TX - LCD, TX-GSM,TX-GPS.


      I use control reg for choise only  input RX, and output TX.


      Please tell me some advices that:


      Fisrtly tell me: I should use while(1) for getchar() data buffer in UART? (or)  I should use interupt UART for getchar() data buffer? Because?


      this is image:

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