On Mon, 21 Feb 2011, David Madden wrote:
On 02/21/2011 10:25 AM, Sebastian wrote:
are there plans to support ATmega644?
Would that be just a matter of combining stuff from ATmega16/32 (which
are pin compatible) and ATmega328 (which has some (all?) new features,
like external interrupts, new timers, USART)?
It looks like there's support for several chips in atmega668base, with
individual chips choosing whatever peripherals are appropriate. That looks
like a good place to start.
IIRC someone else did the heavy lifting to make an atmega168 and
I edited it to provide a base for the sequence atmega48/88/168/328.
They are alike except primarily for the sizes
of the memories and the vector tables.
They share a datasheet.
The 48 and 88 are small enough that they don't need
and don't have RJMP and RCALL instructions.
This is recorded in a bool member called flagJMPInstructions.
I think that it is used to ensure the correct size of ISR vectors,
but I'm not sure.
I had tried to make a 168 from a 128.
One of the many difficlties I found was that the timers weren't much alike.
As mentioned, someone else did the heavy lifting.
--
Michael henne...@web.cs.ndsu.nodak.edu
"Pessimist: The glass is half empty.
Optimist: The glass is half full.
Engineer: The glass is twice as big as it needs to be."
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