Mega internal registers map

Does anyone here have a pointer to a PORT map for the Mega ( to get an idea of what I want to do if I don't do a good job explaining it here, look here: http://www.instructables.com/id/Arduino-is-Slow-and-how-to-fix-it/). I want to be able to do direct PORT access on the Mega rather than DigitalRead's and Writes in order to speed up I/O but I can't find documentation comparable to what's offered for the 168 in the above article.

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DeveloperPermalink Reply by Michael Smith on August 9, 2010 at 6:22pm
The APM code does very little GPIO frobbing, so there's not much to be won here...

Universalr rule of performance tuning - measure first.
Permalink Reply by Ken Jenkins on August 10, 2010 at 5:31am
Actually this is for a different project where, in fact, quite a bit of "frobbing" is going on. I posted here figuring there to be a lot of folks on intimate terms with the Mega.

DeveloperPermalink Reply by John Arne Birkeland on August 10, 2010 at 7:25am
If you want to use the ATmega1280 chip i/o directly within Arduino you need to look at the the Arduino schematics to match the high level pins with Atmel 1280 hardware pins/ports. http://arduino.cc/en/uploads/Main/arduino-mega-schematic.pdf

Sooner or later you also want to start reading the Atmel datasheets. There are plenty of nice hardware features in the 1280 that is not utilized by Arduino. http://www.atmel.com/dyn/resources/prod_documents/doc2549.pdf

DeveloperPermalink Reply by jasonshort on August 14, 2010 at 3:14pm
Permalink Reply by Ken Jenkins on August 14, 2010 at 4:40pm
Thanks ... THAT is exactly what I was looking for. Port mapping. Where did you get it?

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