Originally Posted by
Mugelpower
in a post i read something like this:
By the way I don´t get my Pic 16F628A-20 to work with max Speed regardless of capacitors. Tried several 20 Mhz crystals: No Go! tried several 10 Mhz crystals with different capacitors (27 pF-yes ,22pF-yes, 15pF-yes , 12 pF-no) and they worked.
What could be wrong?
Remember every piece of wire at radio frequencies exhibits the properties of inductance and capacitence, and the reactance of both. Which means the wire acts as both a coil and a capacitor.
Might be you have too much wire attached to the Xtal lines, too many sharp bends in those wires, too low impeadance due to resistance path between pins somehow, If you forget to change the config fuse from XT to HS then insufficient power to OSC. Try using a resonator without additional caps and keep those wires as short and straight as possible.
JS
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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