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What is the purpose of C2 on this schematic below?

How does it work when the microcontroller is being programmed?

enter image description here

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  • what happens to DTR when the microcontroller is being programmed?
    – jsotola
    Commented Sep 20, 2022 at 1:01
  • If SJ1 is connected, and when DTR go from HIGH to LOW, what do you think will happen on the RESET pin? Also read this.
    – hcheung
    Commented Sep 20, 2022 at 1:23

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