randomizer:
The firmware (attached) includes sample code for various Atmel processors, including the 324 and 329, but not the 328. I did look through that and the datasheet to do the same thing on the 328, but I'm thinking it might not be an option there. (I now see chapter 8.9 says the system clock is output on CLKO. So. I was wrong to try.)
Thanks, I sure couldn't find it. And I think I'd seen it before, I remember the pics of the crazy crystal attachment techniques. Might have to look again.
Anyway, I was thinking along these lines as well:
5.2 MegaAVR
An asynchronous timer overflow is used to toggle an I/O pin, and hence the clock
signal will be divided by 2 (nominal frequency of 16384Hz). All megaAVR® devices
are supported, but a device family define needs to be set (see list of defines in the .c
file).
Did you mean to attach something? (Maybe I'm not seeing that either, LOL!) It'd be easy enough to code up the timer as described above. In fact, now I'm curious about it, and I've just cobbled together this frequency counter...