Problem with 16F877A but not with 16F876A

**mister_e** · - 15th May 2008, 20:58

I'm surprised it works with a 16F876a looking at the current ADCONx settings...

**savnik** · - 15th May 2008, 21:48

Originally Posted by mister_e

I'm surprised

Why;
Where i am wrong with ADCONX

skimask · - 16th May 2008, 01:03

Originally Posted by savnik

Where i am wrong with ADCONX

Because you've got digital signals going into a port configured for analog input...

**savnik** · - 16th May 2008, 07:36

Originally Posted by skimask

Because you've got digital signals going into a port configured for analog input...

with 16f876a i use ra0-ra1-ra2-ra5 as analog and ra3-ra4 as digital , and with those configurations work very well.But with 16f877a not.

skimask · - 16th May 2008, 14:11

Originally Posted by savnik

with 16f876a i use ra0-ra1-ra2-ra5 as analog and ra3-ra4 as digital , and with those configurations work very well.But with 16f877a not.

Well, you didn't tell us that now did you?

**mister_e** · - 16th May 2008, 14:18

Refer to ADCON1 register table
http://ww1.microchip.com/downloads/e...Doc/39582b.pdf
page 130

The way you have it right now, all AN inputs are analog.

Thread: Problem with 16F877A but not with 16F876A