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ATmega64a

kalshagar - atmega64a

Memo fact sheet


PROGRAMMING - READ ME

One VERY important thing about programming atmega64a babies : you can do it via SPI but don't use the ports MISO and MOSI ! Sounds crazy ? To me too. But read the doc !
atmega64adoc-extract.png

WHAAAAAT !?? Not using MISO/MOSI but 2 other pins ! WTF couldn't you say that before I send the cards to produce in China ? Ok it's a matter of 1500 JPY but still. I spent hours (literally) searching why my cards didn't work.

... and wait, there's more !
2.3.15 PEN
This is a programming enable pin for the SPI Serial Programming mode. By holding this pin low
during a Power-on Reset, the device will enter the SPI Serial Programming mode. PEN is internally
pulled high. The pullup is shown in Figure 10-1 on page 52 and its value is given in Section
28.2 “DC Characteristics” on page 327. PEN has no function during normal operation.

WHAAAAAT !?? I have ALSO to pull that pin /PEN low when I program ??!! And cherry on the cake, that pin is dedicated to that purpose, can't reuse it ... great.
Edit: In fact it seems you don't have to bring /PEN low, it works fine if not doing it with my pololu programmer. That's one annoyance less.

FUSES - READ ME

And the fun continues : if you don't remove the Atmega103 compatibility mode M103C fuse you can have ... strange behavior. Very strange. In my case, I could call a function but the code never got OUT and the method was stuck in a loop ... wicked right ? Just unset the fuse, maybe set the clock to 8MHz oscillator at the occasion. And you're done.
atmega64afuses.png
All content on this site is shared under the MIT licence (do what u want, don't sue me, hat tip appreciated)
electrogeek.cc ~ Formerly known as Kalshagar.wikispaces.com (AlanFromJapan [2009 - 2017])