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1  Using Arduino / Microcontrollers / Re: ATmega1280 at 8MHz/3.3v on: April 20, 2011, 10:36:33 am
Yes, bubulindo is correct.  I want to be able to power the microcontroller at 3.3 V.  Has anyone had any experience with this?  The frequency of the clock will be changed by using an 8 MHz crystal.  This will be a standalone application, not an Arduino Mega board.  The bootloader is what I am concerned about.  How will it affect my SPI and UART frequencies, and how difficult is it to change the settings to get this to work correctly.  Processing speed isn't the concern, but the porting of 16 MHz code to 8 MHz code is.  I am in the design stage and need to know quickly if I have to try to make a 5 V power rail, but it would require redesign to do so.  I am avoiding the redesign if possible.  Any suggestions?
2  Using Arduino / Microcontrollers / ATmega1280 at 8MHz/3.3v on: April 19, 2011, 04:52:07 pm
I am working on a project where I will be implementing the Ethernet shield over SPI and 2 UART connections. Would there be a problem running this at 8MHz?  How would this be done?  Any help would be appreciated.

Thank you,
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