Hi,
 
I'm confused by the 12F675 datasheet explaination about T_AD and ANSEL. I am going to use a 12F675 with the internal 4MHz oscillator. I'm trying to figure out what value I should set for ADCS<2:0>. 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? I assume I don't have to use x11.
 
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 microseconds for it to be correctly sampled and converted?
 
Thanks,
Laura
 

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