16F877a PORTA ADC and digital help

[sayzer]

Hi RF,

Since RA4 is not an analog pin you get it as digital at default.

Then, the rest is as you needed. See the table below.
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RE0-RE2 meaning that AN5, AN6 and AN7 are needed as digital in your case.

Thus, you endup with
ADCON1.0=0
ADCON1.1=1
ADCON1.2=0
ADCON1.3=0

ADCON1.4=0 'ignore
ADCON1.5=0 'ignore

Then, assuming you want to use RC OSC,
ADCON1.6=0 '(here you should use DEFINE)

Then, you need 10-bit res.,

ADCON1.7=1 'right justified is needed with 10-bit. Left justified is needed with 8-bit.


You are set.

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Edit: Don't forget to set your TRIS registers for input/output thingie.