AVR-Chat

I don't believe you are still using these PIC toys.   :-) :-) :-)


Yingdan wrote:
> Hello,
>
> I am using VREF+ and AVss for a potentiometer. Below is my setting:
>
> status_rp = 01   	-- select bank 1
> CVRCON = 0b_1110_0110
> ANSEL  = 0b_0001_1001
> ADCON1 = 0b_0010_0000	-- VREF+/AVSS
> status_rp = 00		-- select bank 0
>
> The VREF+ pin gives ~1.2v and I can get the reading 0 - 255 in the range of 0 - ~1.2v. The problem is the reading is unstable. When I rotate the shaft from high to low, and low to high, I got different readings for a specific position. From high to low, I got a relative bigger reading and from low to high, I got a much smaller reading for the similar position. 
>
> I have no idea how to fix the problem. Can anyone help to take a look at my CVRCON and ADCON1 registers since I am not confident with them, or offer any help about what might be wrong?
>
> Your help is highly appreciated,
> Yingdan 
>