PIC16F1503 Fixed Voltage Reference

Hi All,

I am working with a PIC16F1503 and would like to use the Fixed Voltage Reference (FVR) as the reference for the ADC.
I have successfully done this in the past using a PIC16F1829 but the same register settings do not apply for the PIC16F1503.

In the case of the '1829:
From the datasheet, setting ADPREF<1:0> to "11" means "Vref+ is connected to internal Fixed Voltage Reference (FVR) module

In the case of the '1503:
From the datasheet, the only two setting options for ADPREF<1:0> are "00" (Vrpos is connected to Vdd) and "10" (Vrpos is connected to external Vref+ pin)
All other options are "Reserved" and there is not FVR option listed.

Can anyone enlighten me on how to use the Fixed Voltage Reference (FVR) as the reference for the ADC on a PIC16F1503?

Cheers
Barry
VK2XBP