The data sheet on page 185 indicates that the internal reference is Vdd
and Vss, but youv'e given me an idea: I use ICSP on the circuit which
means that Vdd comes via a resistor (100ohm). Tonight I will check if
maybe the voltage drop across it is too great thus giving 3.5 volts as
Vdd
Mark


> A2D to use its internal Vref. If I set it to use an external Vref and
> supply 5V and Gnd to the respective pins, I get the correct result.
>

I could be totally missing the point here, but looking at the data sheet
I think the internal reference in only 3v ?  So inputs greater than this
give f.s.d. (0x3f) I think.

(Flame suit on)  ;-)

Peter


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