Thanks !!!!
i will try it today,i'm almost sure it will work,because it does not use interrupts,and no pause or oscillator related critical functions...
Another question,is the ad converter initialization different in 18f452? i want it to convert as fast as possible,i had good results with the ad in 16f877,and i wonder if i could run it faster in the 18f...
thanks a million again..

Maneco