Computer shuts off

digitalfreak · Joined: 16 Feb 2005 Posts: 25

MPLAB7.42 + ICD2 (USB) + 18F8452 + PICC

Iam facing the following weird problem :

This happens randomly and I could not repeat its occurence.

When I start working on the project everything is fine and I could successfully connect, program and verify the program on the PIC using ICD2. Suddenly my computer shuts down, incidentally this happens

1. when I connect ICD2 to the powered target or
2. when I turn on the power of the target while it is connected to ICD2.

And it doenot happen every time the do the above.
It happened 4 times with in 15 hrs of working time, like I said it is random and I could not repeat it.

Interestingly I could not reprogram or connect to the target PICs, which were in use, while this horrible shut down happened. If I replace the PIC everything is normal again. I am worried that this might happen again. Can you please let me know what could make this happen?

I am assuming it got to do something with ICSP connections or some kind of ESD ??? .How can I protect my PICs and how can I stop the host computer turning off??

How can I upload image for schematic?

Following are the header and fuses i used....

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

This is really a Microchip ICD2 issue and not a CCS issue.
You should post it in the ICD2 forum. Also, tell them the O/S that
you're using (Windows XP SP2, etc.). Here's a link to the forum:
http://forum.microchip.com/tt.aspx?forumid=49

Also, on the Microchip forum, I believe you can upload images.
(Can't do that on this forum).

digitalfreak · Joined: 16 Feb 2005 Posts: 25

Thanks

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

I notice that you posted it over there, but the schematic isn't viewable.
It shows a thumbnail image, but if I click on it, all I get is an "X" in a box.

I know that posting images can work, because here's a thread over
there that's near yours in the list and it has a picture of a breadboard
and clicking on it works just fine.
http://forum.microchip.com/tm.aspx?m=189927

You need to edit your post over there and fix the schematic.
Test it after you're done, to make sure it's viewable.