> It says set it to x11 = F_RC (clock derived from a dedicated internal
> oscillator = 500kHz max)

> That's a different clock than the other internal 4MHz oscillator, right?

FRC kind of implies the RC oscillator (see Section 9.2.4) but don't
know why it's limited to 500kHz (elsewhere RC is 4MHz). I've never
used this setting. I thought it may have been something to do with
Timer1's OSC but that's only 200kHz

Anyone know for sure ???

Table 7-1 is what you need to look at. Note the shaded cells and
comments

> I assume I don't have to use x11

No, I'd assume that 001 or 101 would do you (with ref to Table 7-1)

> My analog input will take miliseconds to change in value. I think that
> means I can safely select ADCS = 001 = 8T_OSC @ 4MHz = 2.0
> microseconds. If I picked that setting, does that mean that my analog
> input will only have to hold for at least 2*2microseconds = 4 us for
> it to be correctly sampled and converted?

See the data starting page 101 : Tables 12-8/9/10, Figs 12-10/11

Also

A/D & Measurement Tips & Tricks Using the 8-Pin PIC12F675

http://ww1.microchip.com/downloads/en/Market_Communication/quicktipdec02_2.p
df

http://ww1.microchip.com/downloads/en/Market_Communication/quicktipjan03.pdf

Tips & Tricks Using the 8-Pin PIC12F675

http://ww1.microchip.com/downloads/en/Market_Communication/tipsnov02_1.pdf

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