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data transfer from Tiva to atmega using spi

Mitesh Sirodaria
Intellectual 880 points
Other Parts Discussed in Thread: TM4C123GH6PM

Hello,

I want to send data from tm4c123gh6pm controller to an atmega328 via spi communication. Has anyone did this???

Main concern I am facing is atmega controller works at 5V logic and tiva controller at 3V3 logic. So is the data communication possible?

  • 0
    TI__Guru**** 244400 points

    Hello Mitesh

    TM4C123 has 5V tolerant IO's so a 5V input coming from Atmega would be seen correctly. However TM4C123 drives 3.3V output only.

    What you need to check is

    1. The VIH of the Atmega IO's can see a 3.3V input as a valid 1

    If yes to above then how much margin is there. If no then you would need level translators.

    Regards

    Amit