Myke, Also, probably obvious as well, but did you try unbalanced caps? --Bob On Thu, Sep 23, 1999 at 09:42:09AM -0700, Tom Handley wrote: > Myke, I'm probably not of much help other than to suggest the obvious > which you already know: > > 1. What's MCLR tied to? > 2. Any noise on the supply rails? > 3. Is this on a plug-in breadboard? That adds capacitance. > 4. Is it a parallel resonance crystal? > 5. What Oscillator mode are you using? > 6. Is LVP enabled? If so, what's on RB3? > > I recently upgraded a 16C77 prototype to a 16F877 (using ES samples) > and I've had no problems running at 20MHz with 18pf caps at 5Vdd. I'm using > a microEngineering Labs PicProto64 board. > > - Tom -- ============================================================ Bob Drzyzgula It's not a problem bob@drzyzgula.org until something bad happens ============================================================ http://www.drzyzgula.org/bob/electronics/ ============================================================