Topic: Standalone Atmega8u2
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Oct 17, 2012, 04:26 pm
I have put together an Atmega8u2 on a breakout board, for the purposes of putting the Hiduino (
firmware on it, for communication with non-arduino-standard Atmegas (ie. 164/644/64 etc.).
Using the most basic circuit,10k pullup on reset, 16mhz resonator and 5v,gnd,rst,clk,mosi,miso to the USBasp (or arduinoISP), I try to load Hiduino on it but I'm yet to be able to get avrdude to recognize it.
-> avrdude: error: programm enable: target doesn't answer. 1
So I have a few questions.
Firstly, does anyone know whether a 16mhz resonator is good enough for this purpose? Or is a crystal necessary?
Secondly, this Uno (rev 1?) schematic I found shows a 27 Ohm resistor in series with the crystal
and the official rev3 schematic on this site, has a 1M in parallel with the crystal. Can anyone shed some light on what these are for? Should I do this? Which one should I do?
And lastly, if anyone has any other ideas why this might not be working (initial factory settings problem with the 8u2 chip?) I'd be grateful for any kind of advice.