At 08:23 1998-04-01 -0800, you wrote:
>>
>> > Have lost pins at 9 volts, and the chip stops, but works again at normal
>> > voltages(without the pins that burned out).
>>
>> That's interesting.
>>
>> Some time ago I was interested in protecting PICs more than just setting
>> the fuse bit.  Burning an IO pin that plays an important role during
>
>Actually, I should have said that after running the PIC at 9 volts, any
>pins lost still seemed to work fine as inputs :-)

Even better, if we then just can make reading out program impossible, but
still can use the pin as input.

But I am really worried about
1)      Lifetime (we must have hurt something?)
2)      Some exessive cirrent drawn by the destroyed output.
3)      Lowered input impedance etc due to partly destruction?

Did you test input parameters change or supply current change?

/Morgan

>Cheers,
>Bob
>
>
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  mrt@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /