Mike Hord wrote:

> IIRC, the ICD2 manual discourages this practice because it can affect
> the timing with which the line is brought to Vpp.

Good point, and yup, you definitely recalled correctly Mike.

Anyone designing for ICSP should definitely read the programming specs for
the device they are using since some (not all) of the programming specs on
the PIC18F, for example, call out a *maximum* of 1 uS rise time on MCLR/VPP
to enter Program/Verify mode. Depending on the output impedance of your VPP
source, it won't take much capacitance to violate this spec.

Best regards,

Ken Pergola

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