Did you set the project build from "Debug" to "Release" having a much stronger optimization level? Debugging is barely possible with that setting, but if that works I can help you further...

Bob

There is a (bit time-consuming) way to get all you want: By right-clicking on a generated C-file you may select "Build Settings" from which you can now select for this file the "Release" compile. This will reduce flash usage for all the files you do not need to debug.

Bob

Tom, would you mind posting your "final" working project. I have a

son that wants to put a data logger on his Motot Guzzi bike to optimize

tuning, and it would be handy if I do not have to re-invent the wheel.

Regards, Dana.

The internal reference can be brought out for other uses on the ADC. You just need to select internal reference 1.024V bypassed and I would add a op amp  buffer to prevent loading of the reference.

But even then its available only on the external pin, not for internal routing.

If you abandon Vdda as Vref then of course you will need external

R dividers to handle the higher Vxin you want to measure. But

you would gain a net higher accuracy by using the internal Vref and

precision thin film Rdivider.

Regards, Dana.

Intdernal reference -

Its 2 %, maybe use an accurate external Vref to power Vdd and eliminate R dividers on

input pins. 2% is ~ 6 bits, food for thought. Or use ext ref directly on SAR.

Regards, Dana.