Hi! >> Isn't there the posibility to us an RC-Combination for a quick test? > >Yes, but not as certain as with a canned oscillator. Use the advice >on page 36 of the data sheet. Just be sure that your cap >20pF and >your resistor is >3K and <100K. I have never used the `84 in RC mode >so I can't suggest some nominal values to try. I can tell you that >you leave the OSC2 pin unconnected and you can look there for your >clock. It should be 1/4 of the frequency of the RC oscillator. Once >again, take care to assure that your configuration fuses are being set >properly. I just tried with RC. It didn't work :( I tried it with two 16C84 and a 16F84. I think there's a problem with my current. I have exactly 5 Volts at the PIC. Is this ok? Do I have to conect any other pins than Vcc, Vss, OSC1 and OSC2 for this test? Is it possible, that if my software is broken it stops the clock? Ciao, Tommy