Hello
I have been understanding ADC, but the PBP manual only shows the option 3 (RC)
when defining its clock letting in the nothing the explanation of the options 0 to 2 (that is an omission in the manual). Is this (3) the best option to use de ADC? Or maybe the only one reasonable?

I'm using the 4550 with a 20 Mhz crystal. Do the 0 - 2 options would use this clock? Would it have any advantage respect using the AD RC? (I understood it is internal so I have to do nothing for it to work)

I saw in the 4550 manual about the tad and fosc selections but I suppose that PBP makes that I can ignore them. Am I right?

Thank you for your gentle advice.
Luis Jiménez