PIC18 A/D q. select analog

[Beginner]

I must use analog port in PIС18F4320 :
as PIN RA3-Vref+; RA4 - button; RA5 - analog in;
RA0,RA1,RA2-digital i/o ;
How I can do this?
If I can use analog port as
only: A0, or A0 and A1 or A0 and A1 and A2 //etc/
in header file.

PLEASE answ/ me!

[Ttelmah]

Read the data sheet for the chip.
You can only configure the port as the _hardware_ allows. What you describe cannot be done.

Best Wishes

[Beginner]

So If I use Vref , then I can't use RA0,RA1,RA2 as digital io?

[Mark]

[Beginner]

And about this:
I use PORTA0,1,2 as digital output and can use analog input(RA3 - Vref; RA5-input;) when digital don't use . So I must commutate from analog to digital.


This is too not correct????

[Beginner]

By communitate with function setup_adc_ports();?????