• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 97 subscribers
  • Views 344 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

C6747 UART 1 Tx - Pull up Required?

terry ding
Prodigy 10 points

We have daisy chained the UART 1's of several DSP's together. That is, Tx of one DSP to the Rx  of another. There is a 22 ohm resistor between each but I would like to know if a pull up is needed?

 

Thanks,

 

Terry

  • 0
    TI__Mastermind 27585 points

    The pull up is necessary only if you want to avoid a possible null character transmission out of reset. Since the pins are all weakly pulled down internally during reset, the receiving device might detect that as a null character. If the DSP UARTs won't be enabled until after reset then this shouldnt be an issue.

    Jeff