Hi Skimask,

actually, I'm using a 18F2520 with a 20 Mhz ressonator and a DEFINE OSC 20 at the begining.

The data Sheet says that the clock runs at 4x by default. It means that I can use a 10 Mhz crystal with a DEFINE OSC 40 ?

I'm going to do some changes in the source code and try to check what's happening.

Regards.

Sérgio