Thank you for the reply.

But I don't do ADC on the output pin RA1. I just want to output RA1 to a
constant high. But it seems that ADCON1 has an effect on it despite the fact
that I set TRISA1 to 0.

Question: how do I set RA0 to analog input and RA1 to digital output?


----- Original Message -----
From: "Jeff DeMaagd" <jeff@DEMAAGD.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 14, 2001 9:13 AM
Subject: Re: [PIC]: TRISA and ADCON1


> ----- Original Message -----
> From: Tony Nixon <Tony.Nixon@ENG.MONASH.EDU.AU>
>
> > > Who can explain to me what the last sentence means? What does it mean
by
> > > "the digital output level (VOH or VOL) will be converted"?
> >
> > If you did an anlog conversion on an analog pin with the TRIS bit set as
> > zero, the converted value will be either 0 or 255, corresponding to
> > Logic 0 and Logic 1 which is whatever the output state is.
>
> If there is a load on the output pin and you do an A/D on that pin one
might
> actually find a state between 0 and 255.  Microchip's data sheets need
very
> thoughrough reading as the line about making all the associated TRIS bits
> set as input is just a line dropped in the text somewhere.  It's
definitely
> there but it's too easy to skim across it.
>
> Jeff
>
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