ADC timer definition

[richard]

I have studied the manual and it doesn't have the text you showed, surely I have an older version. (if you would have a link)

http://melabs.com/resources/index.htm#Manuals

With this information I'm not quite sure about what to do except letting the define_clock at 3.

for a pic18f4550 @20mHz the rc clock [3] is a poor choice (see data sheet) if you are using the adcin command . for accuracy the device needs to sleep during the conversion according to the data sheet and adcin will not do that

[luisfe]

Thank you again.
Then ADCIN is an instruction nobody should use in order to have precision?
Excuse me but I have another question, If I use the pins dedicated for AN2 and AN3 in another matters, will the ADC have the 5 volts of Vdd as reference as default? (I hope so because I have any pins left) Or I have to use necesarily AN2 and AN3 to specify that reference?
Have a good day or night.
Luis

[richard]

Then ADCIN is an instruction nobody should use in order to have precision?

why would you say that ?
adcin is only an issue if you use that chip [pic18f4550] with the adc clock option 3 [rc] and fosc > 1mHz
with fosc=20mHz adcin is fine with adc clock option 5

If I use the pins dedicated for AN2 and AN3 in another matters, will the ADC have the 5 volts of Vdd as reference as default? (I hope so because I have any pins left) Or I have to use necesarily AN2 and AN3 to specify that reference?

the default powerup state for vcfg is 00, which defaults to vss/vdd for reference

[luisfe]

Thank you very much. I'll use it so and tell you what happens.
Luis