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Re: [avr-chat] avrdude & ATmega644a?

From: Rick Mann
Subject: Re: [avr-chat] avrdude & ATmega644a?
Date: Wed, 5 Jan 2011 14:24:17 -0800

On Jan 5, 2011, at 13:56:51, Joerg Wunsch wrote:

> As Rick Mann wrote:
>> Is that also true of 644P/V (I think the V is industrial temp
>> range)?
> Now you've caught me ... I forgot that the ATmega644 and ATmega644P
> are fairly different devices (which is the exception; normally, P and
> non-P devices don't differ much).  Now, I'm not sure whether the
> ATmega644A inherited the (reduced - only 1 USART) feature set and the

Actually, the 644A and 644P each have 2 USARTs (it's the reason I chose the 
644A; well, that, and I couldn't get a 324A anywhere). The 644 has only one.

> device ID from the oringal ATmega644, or instead is more compatible
> with the ATmega644P.  Please check the migration notes from Atmel.

I didn't see any obvious migration notes, but it occurs to me now where to 
look. Hrm. I can find a migration note for 644 -> 644P, but nothing for the 

There's a little bit in another note about crystal cap values for the 644A.

On cursory inspection, the 644A is just like the 644P.


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