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ICD-64U and TX2=PGC

 
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hmmpic



Joined: 09 Mar 2010
Posts: 314
Location: Denmark

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ICD-64U and TX2=PGC
PostPosted: Mon Mar 10, 2014 9:20 am     Reply with quote
Hi

Now I used some hour finding UART2 is (not) working?

The problem is ICD-64U is connected to PGD & PGC. After debugging or programming it hold PGC -> TX2 (same pin om 18F26K22) = L. Is that normal?
When removing ICD-64U all is working. I think it is not nice design to have low impedance load or holding pin L.
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Mar 10, 2014 9:36 am     Reply with quote
First general comment, all unused inputs should be held high or low....
Better design than leaving them floating.

The PGC pin _must_ be held low, if the chip is programmed in 'debug' mode, or it won't run reliably.This is why the ICD does this.
hmmpic



Joined: 09 Mar 2010
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PostPosted: Mon Mar 10, 2014 10:22 am     Reply with quote
Hi

It is the same problem in clean programming mode:-(
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