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The FVR is quoted as -8 to +6 % in the data sheet - not marvellous.
I measured the temp indicator adc output as 776 at 25 deg C and the calculated value is 855, so the error is 79. Using the uncorrec ...

Yes, I think that is really part of the problem: there are just so many variants out there it becomes quite tedious searching for just the "right one".
But hey, variety is the spice of life ...

Actually, I'm not "over-engineering" anything. You may note, if you read back a bit, that I am simply adapting a spare pcb with a micro and a lcd on it to a different purpose. It is/was a ma ...

Thank you for that detailed examination. I see from the data for the 16F1826 that the first transition does indeed occur at 1/2 LSB above Vref(-) and the final one at 1.5 LSB below Vref(+).
Taking yo ...

Should be an edit, but here goes:
I use ref-lo as Vss and ref-hi as Vdd and the input as FVR, then ADC = ( FVR*1023)/Vdd
Is that it?
So the Vdd = ADC/FVR*1023
For a 4.5 V Vdd and a 2.048 FVR, ADC ...

I'm very pleased to have read through this forum, it makes me feel a little less stupid! I, also, have been reading through AN1333 and wondering why I/they bothered.
I happen to have a small board w ...

Thank you, you got me thinking, especially about the message "Undefined label" or whatever it was. It seemed to me that the compiler was not using the correct header file, so I searched for ...

V 4.104

Sorry, my typo, htm.
That other stuff is not in my 16F1826.h file.
Perhaps I'll try that? But why do the definitions in the .h file that I have not work?
Here is the relevant section from my .h fil ...

Yes, that is correct. I note that the PCM.htl file shows it simply as A0, but the .h file shows sA0 so that is what I used.
It compiles OK if I leave out the VSS_FVR.

I am using a 16F1826 with V4.104 PCM and it won't allow me to set up the ADC reference with setup_adc_ports(sA0|VSS_FVR);
The compiler returns the errors "Undefined Identifier VSS_FVR" but ...

The lesson to be taken from this is if the there is a valid interface to the Uart hardware pins and the RDA interrupt code is set up correctly and the RDA doesn't fire then a software UART may have be ...

I did not put the 'xmit= PIN_A4' and 'rcv=PIN_A5' statements in the code in my post !
You should NOT do it. You should use 'UART1' ONLY ! (After this I give up).

You are quite right, I didn't ...

Post your latest test program.

Here it is: Note that it sends one char when I power it up, as it should since buffer is true (usually 0xFF)

#include <12lf1822.h>
#device ADC=10
#fuses IN ...

That's right, because you're not setting the APFCON register bits to
select the alternate UART pins. The compiler won't do that for you
automatically just because you specified the alternate pins ...