18F2431 Learning Curve

[Aussie Barry]

Thanks Henrik.

I have downloaded the datasheet from your link - I have been working off a preliminary datasheet dated 2003...
At least we are on the same page now

Thanks also for the detailed explanation on OSCCON bits.

Just to clarify - I did mention in my previous post that both OSCCON setups worked. Also, there was a typo in my previous post; my setup was OSCCON = %01111110 (I left out one of the "1's")

ADCIN doesn't work with the ADC on 18F2431

Oh, man.... What a bummer!
Looks like I have more research to do on running it manually. I will do some searches and see what I can find from Bruce's previous posts.
I am almost too scared to ask why it doesn't work but I am sure as hell it caused some major grief for people in the past.

Cheers
Barry
VK2XBP

[HenrikOlsson]

I am almost too scared to ask why it doesn't work but I am sure as hell it caused some major grief for people in the past.

The reason is that the ADC is a bit different, and a bit more complicated, than on other chips. On the 18F2431 there are two sample and hold circuits so it can sample two analog voltages at the exact same time (and then convert them one after the other). It can also be setup to run continously in various configurations and put the results into a 4 word FIFO, an interrupt can be generated at various "fill levels" of the FIFO.

/Henrik.