> If the programmer's output clock line was low impedance, 
> this wouldn't
> happen, right?

The effect is caused by the rise time of the 'source' line, combine with
the high impedance (only at the target side?) of the other line. A
series resistor softens the rise time, and damps ringing. A capacitor
softens the riste time, and (when placed at the target) provides a
low-impedance.

A low impedance of the clock output driver can only worsen the effect.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu
 

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