How to set one pin as ANALOG all others as DIGITAL, and Vref=Vdd ?

For F877,

On PortA, how do we set AN0 as analog, all others as digital and Vref=Vdd?
I am trying to have one analog channel and remaining pins as all digital on this port.

Thanks for the help in advance.


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Set bits 3-0 of ADCON1 to 1110 (as described in the 877 Datasheet DS30292C, page 112) and you will be all set.

Paul Borgmeier
Salt Lake City, Utah
USA

Thank you Paul.

In this case, the table shows me, as you already pointed, the following explanation for it; just as I need.

ADCON1 REGISTER for bit3-0: 1110

Meaning that:
AN7=Digital
AN6=Digital
AN5=Digital
AN4=Digital
AN3=Digital
AN2=Digital
AN1=Digital
AN0=Analog
Vref+=Vdd
Vref-=Vss


After setting the channels and the Vref with Bit3-0 as above, then I need to set Bit7 as 1=Right justified. Then, Bit6-5-4 are left untouched as they are 0.

Finally, I come up with an ADCON1 register as follows.

ADCON1=%10001110

I also set ADCON0= %11000001 to match ADCON1.

and it works.

Thanks again for the guidance Paul.