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Topic: Arduino UNO microcontroller type? (Read 1 time) previous topic - next topic


Hi all,
  I was talking a look at my arduino uno, and it seems that there are in fact two atmel chips on the board?  There is the large chip, which I assume is the main microcontroller, but there is also a small, surface-mount chip (mega 18U2 I think).  What does this second chip do??  Does it contribute to the main chip's function? 

Fat D

16U2 actually. It provides the USB interface to the Arduino's serial port, that is all. It used to be done by a dedicated FTDI converter, but apparently the secondary controller was deemed cheaper and more versatile despite all the additional hardware (capacitors, quartz crystal etc.) required.


Ah, that's what I had suspected... thanks!


Hi members,

I bought a Uno SMD R3
I want to program it with Bascom
What type Atmel is on it?
Not an atmega 328, I tested m328 def and m328pdef
I use Bascom AVR

Please give me advice.
Thanks in advance.

Greetings, Dré Jansen (Netherland)
(groot)vader van 3 kinderen, 2 kleinkinderen. WWer, dus als u werk hebt....
hobby's mechanotronica en (tour)fietsen.


An Uno of any type should have an ATmega328P microcontroller as the main CPU.  It also has another avr (16u or 8u) that works as a usb/serial converter, but that's not connected to much of anything other than the USB port.

I don't know if the Arduino bootloader is supported by any of the BASCOM "programmer" types...

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