Hello,

I've tried using a few different oscillator configurations on the PIC
16C84.  I just wander:  what's the real difference?  I have the 10Mhz
version of the chip and it seems to work well with both the XT and HS
configuration at around 4 MHz.  The most surprisging result was
obtained in the RC oscillator option using R=4.7 komhms and C=none
(not recommended).  My oscilloscope showed that OSC2 was running at
3.5 MHz meaning that the input at OSC1 was really at 14 MHz!!

Am I just lucky that my PIC can run at this speed,  or is it something
within the PIC that maximizes the frequency to one that could be run
on-chip?  The question could be:  if I ignore the clock accuracy, can
I use only a resistor as a clock and be sure that the PIC will work at
all?

Staffan