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J series sensitivity to wiring errors

 
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Charlie U



Joined: 09 Sep 2003
Posts: 183
Location: Somewhere under water in the Great Lakes

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J series sensitivity to wiring errors
PostPosted: Tue Jun 03, 2008 8:34 am     Reply with quote

I was wondering if anyone has some experience with the J series parts that might give me a clue to their sensitivity to wiring errors. I am using a J series part for the first time. The part is a PIC18F66J11. The target board is adapted from an existing design and I am attempting to "adapt" the processor via a small pcb. The ICSP interface is just wired directly onto the board. On my first attempt, I wired the interface in mirror image. I tried the ICD and it did not recognize the target. Realizing the error of my ways, I rewired the interface. The ICD still won't recognize the target. I have run through the diagnostics and everything appears fine. I have clicked the button for J series parts. I have also connected the ICD to a different board with a non-J series processor running at 5V and it works.

The bottom line is do you think that the part could be damaged from the mirror imaged interface?

Thanks in advance for any replies.
Charlie
Charlie U



Joined: 09 Sep 2003
Posts: 183
Location: Somewhere under water in the Great Lakes

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PostPosted: Wed Jun 04, 2008 1:00 pm     Reply with quote

To follow up:

The original board had a reset chip on it that was removed. There was a solder bridge on the pads that connected the MCLR pin directly to Vdd. After removing the bridge, the processor is now recognized by the IDC.

No more excuses . . . time to write some code.

edit:

To answer my original question, it appears that the processor is robust enough to handle the mis-wiring of the ICD interface.
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