is the 16F690 AD crappy ? missing steps on 10bit AD

[Darrel Taylor]

so what about ANSEL ?
does ADCIN handle that automatically ?
it seems to work the same whether or not i explicitly set the ANSEL bits

You can read Analog no matter which state ANSEL is in.
It's Digital that has a problem, and always reads 0 when ANSEL bits = 1.

Frankly, I think they should have called the register ... DIGSEL.

P.S.
But, when Digital is enabled on an analog pin, it adds an extra load, can throw off the analog impedance, and adds switching currents when the analog signal is near the input switching levels.
Especially prevalent on TTL inputs.