UDOO QUAD : schematic question

Discussion in 'UDOO QUAD' started by parkjaehoon, Sep 21, 2017.

  1. parkjaehoon

    parkjaehoon New Member

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    I am watching UDOO QUAD's schematics.

    I have a few questions.

    On page 2 of UDOO's schematic, connection of the F/F appears seems strange.

    first, I don't know what purpose circuit the circuit shown below is.
    I guess it's going to be a problem when the Q pin's output is low.
    I also don't know what purpose the PR pin is.

    test.png
     
  2. sirrab

    sirrab UDOOer

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    PR is preset. i.e. Force Q high and notQ low. So, at power up, Q will be high.
     

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