i have a project with pic 16c(f)84. now: * do i have to use the capacitors with the xtal connected between osc1 and osc2. * where can i find reference to xtals? behaviour and mathematical model. thanks in advance. -- Guven Demir. Email: guven@compclub.itu.edu.tr HTTP : www.compclub.itu.edu.tr/~guven