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How to wire up an Atmega32u4

j4cobgarby

Sep 18, 2018
49
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Sep 18, 2018
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I'm designing a keyboard PCB, and I need to use a microcontroller to send data over a micro-USB port. I've picked the Atmega32u4. Now, I'm not entirely sure how to wire it up. I've attached what I've got so far.

So, I want to wire it up in such a way that I can program the firmware over USB. I assume I've hooked VBUS, D+, and D- to the correct pins, although I don't actually understand what these pins are.

Even though I've read the documentation, I'm not sure what the other pins on the microcontroller do. I'm under the impression that XTAL1/2 are for the clock, and it's pretty obvious what RESET does, but certainly I don't understand the others.

What I'm looking for is some example of a atmega32u4 wired up to a micro USB connecter, which I can study and then figure out how to wire up mine.
 

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BobK

Jan 5, 2010
7,682
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Jan 5, 2010
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7,682
Look at the circuit for an Arduino board that does that.

Bob
 
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