we tend to use 4meg ceramics a lot  and tho' we get them from various
suppliers, find about 10 per cent or so won't work. (on any pic)





>        Has anyone else had problems with pics and oscillators? we can
>not get the levels on the OSC1 and OSC2 pins to a sufficently good level
>the mchip data book says 0.7xVDD however getting this takes a large
>ammount of time and playing arround. We found that for a 71/54C @500k
>the best values were 150p(osc2) and 100p(osc1) but then the load
>capacitance is unmatched and the waveform on osc1 is distorted. Has
>anyone done any work on getting the best out of resonators(murata are
>the ones we use). We use 500k 2M and 4M, with each increase in value it
>is becoming harder to get 0.7VDD any ideas/ recomendations.
>        Sory to go on about it but anyone seen the ATMEL AVR simulator
>yet... they put in a command line like the old MPSIM for DOS, Horray :-)
>
>        Robert Drake - Development Engineer EMS