> I want to use a 16C73 to read five analog sources.  But at the
> same time, I need to use the SPI port in master mode to drive
> a MAX7219 LED driver.
>
> If I enable the SPI, does that always take away the ability to use
> the A/D input pin AN4?  I don't need the *SS signal, so if I
> try to read an analog input on AN4 will it work?  Or do I have to
> disable the SPI first (which would be a major pain)?

Pin RA5 only becomes the /SS pin when the SSP module is put into SPI slave
mode.  In SPI master mode, RA5 can be used as a general I/O pin or AN4.  No
funny switching required.

Note that if you want to use all 5 analog inputs, you will need to use Vdd
as Vref for at least AN3.

-Ed V