How to set pins for external vrefh and vrefl?

[oxo]

Hi all,

chip 18F26K80
compiler 5.045

I have analog inputs on AN0 - AN3.

I can't figure out how to select AN8 as VREFhigh and AN10 as VREFlow.

In the 18f26k80.h file it mentions

set_analog_pins(int32 pins, int32 reference);

but I can't find any document or help entry describing what it does.

[Ttelmah]

You can't.

This is all down to reading the data sheet. Vref+, is pin RA3, Vref- is pin RA2. Fixed. Can't be changed.

You need to move your input signals to a couple of other pins.

Generally 'reference' analog signals can't be moved. Unlike digital signals, where a simple multi-line decoder can be used to move them around, analog signals require a complete multiplexer, and this has a significant impedance. Not too important on the analog inputs, but disastrous on things like reference voltages....