Agreed. The series resistor softens the wavefront, reducing the
radiation effects to the nearby wiring.

The PIC has a Schmitt-triggered input in program mode, so the
R won't prevent proper operation even when it is larger. An R of
100 ohms should be right.

The RJ12 of the ICD2 is a problem, as the wires are bundled too
tightly. 

--Bob

Wouter van Ooijen wrote:

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


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