OK guys, I will explain again.

I bought a crystal at radiospares :
35.2512 Mhz (ref :1790035) Kony.
and it oscillates at around 11.7 Mhz, but its is marked "35.251200 Kony 031"
I suppose it should be used on the third harmonic, but the Dallas operates on the first (OK forget for the overclocking)

The question was : how to make the Dallas micro oscillate on the third harmonic (the frequency written on the quartz)

Thanks.

Elia