On 2013-04-06 9:47 PM, Spehro wrote:
> A signal generator or other separately powered device connected to any in=
puts?=20

Can't believe I overlooked this one; I have a REAL ICE connected to one
of the microcontrollers at all times. The VPP/MCLR, VDD, VSS, PGD, and
PGC pins are connected. The VPP, PGD, and PGC pins aren't connected to
anything else other than their respective microcontroller pins, and
they're all high-Z inputs so I'm guessing they should be isolated CMOS
inputs? Practically, I have a strong feeling they're not isolated
inputs. Or am I mixing up isolation with MOSFET insulated gates?

Could it be possible that a high voltage signal introduced on the VPP
line during programming somehow propagates through the microcontroller?

Or some other transient signal coming through the REAL ICE VDD/VSS line?

Shouldn't the REAL ICE be protected/protecting against this kind of stuff?


--=20
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