Debugger /cpu reset after continuing from a breakpoint

eric · Joined: 16 Sep 2003 Posts: 21

Not sure if this is a familiar topic or not.

I'm using the CCS TCPIP stack for tx/rx udp packets on PIC18F67J60 and it works quite well enough.

But when I have had coding issues, and set breakpoints on any given line, it stops nicely but when hit "Go" to continue or single step, the CPU resets- program counter goes to 00. This of course makes debugging somewhat limited... pretty much reduced to printing to monitor.

Is there something that the debugger outputs as a trace that I could look at or set up to solve this?

This happens on two different projects, though both with the TCP/IP code.

n-squared · Joined: 03 Oct 2006 Posts: 99

Make sure you have NOWDT among the fuses.
_________________
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Franck26 · Joined: 29 Dec 2007 Posts: 122 Location: Ireland

Hello,
I had a similar problem with a pic18F2520.
The program counter was jumping everywhere when using single step.

This was happening only if the ICD-U firmware was 2.51 or higher.

The issue was that one of the ICD output (PCD or PCG, I don't remember) was not able to give 5V (~4V).

The ICD firmware 2.51 and higher have a faster communication bus than earlier firmware. I suppose that it was not compatible with my low output voltage. I changed the ICD, it fixed the problem.

Good luck,
Franck.