> After doing more testing on my ICSP circuit I strongly
> believe that the
> PIC isn't going into programming mode once VIHH is applied to MCLR. It
> simply goes along and executes code as normal. Has anyone seen similar
> behaviour?

Is the Vpp voltage high enough? Does it rise quickly enough from 0 to
Vpp?

Wouter van Ooijen

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consultancy, development, PICmicro products

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