Isaac Marino Bavaresco wrote:
> That's not quite correct. A pin configured for analog input but with
> TRISx == 0 will be a digital output. When reading the pin digitally it
> will always read zero, but the pin will source or sink current
> accordingly with PORTx bit.

Hmm.  I do remember seeing it stated this way in some newer data sheets, but
I also thought I've run into the problem a long time ago where a output
didn't work because the A/D was still configured to use it.  I just checked
with my old 16F876 data sheet, and the schematic for a port A pin with
analog input confirms what you said.

I don't think I've had a occasion to deliberately mix analog and digital on
the same pin, and my development environment pretty much prevents me
accidentally leaving a analog peripheral enabled unintentionally, so I
haven't actually run into this for many years.  Am I just misremembering
this, or is there really some interaction with digital outputs and analog
peripherals?


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