You're so right ! I don't know how i missed this. Thanks !

A couple of day's ago i found a timer calculator, i just entered the frequency and the calculations were made. However, it seems that the scrollbars that are used to set the prescalers and preload values in this calculator are refreshed after clicking calculate. I was using bad combinations every calculation.

I tried your values, and it worked like a charm, thanks for replying !

Thanks !