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Topic: Bootloader for Pro-Mini - Atmega328 3.3V 16MHz (Read 1 time) previous topic - next topic

shibaluni

It's not on the list.

Theres Pro-Mini for 3.3V at 8MHz but not 16MHz.

Help?

johnwasser


There's Pro-Mini for 3.3V at 8MHz but not 16MHz.


That's because you aren't supposed to run an ATmega at 16 MHz with a 3.3v supply.

The bootloader doesn't care what the supply voltage is.  If you overclock your 3.3V ATmega to 16 MHz just use the 5V 16 MHz bootloader.
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funkyguy4000

Check the Atmega328 datasheet.
Atmel states that the ATmega328 cannot run at 16 MHz with only 3.3v
It can't work
Accelerate to 88 miles per hour.

johnwasser


Check the Atmega328 datasheet.
Atmel states that the ATmega328 cannot run at 16 MHz with only 3.3v
It can't work


"Not guaranteed to run" and "cannot run" are two different things.  Lots of people run their 16 MHz ATmega at 3.3v and they almost always work. :)
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funkyguy4000

Then why would they say it can't run at that speed at that voltage?
Accelerate to 88 miles per hour.

johnwasser


Then why would they say it can't run at that speed at that voltage?


They know from testing that some of their parts will fail under those conditions.  They want to be able to tell people who run under those conditions that they clearly state in the datasheet that you should NOT try to run under those conditions.  "You cannot expect to hold us responsible for systems failure when you run the processor outside the specified parameters."
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NI$HANT

Running a ATmega with 16Mhz clock at 3.3v will show erratic behaviour it should atleast be supplied with 3.8v at minimum or replace the clock with 8Mhz if you want to run the system on 3.3v or unsolder the 16mhz clock and use the inbuilt 1Mhz clock on ATmega.
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funkyguy4000

Quote
They know from testing that some of their parts will fail under those conditions.  They want to be able to tell people who run under those conditions that they clearly state in the datasheet that you should NOT try to run under those conditions.  "You cannot expect to hold us responsible for systems failure when you run the processor outside the specified parameters."


Ohhhh okay
Accelerate to 88 miles per hour.

funkyguy4000

aw geez, I look at this now and I sound so stupid  :0
Accelerate to 88 miles per hour.

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