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ICD-U40 problem.....

 
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ICD-U40 problem.....
PostPosted: Mon Nov 27, 2006 11:07 am     Reply with quote

Hi,

I am using the ICD-U40 with a PIC16F628 design. The ICD checks out when I 'Test ICD' and the target checks out when I 'Test Target', but programming does not work correctly. The .hex file is uploaded to the PIC but there are lots of Verify errors. By experimentation I found that the PGM pin is the culprit. I am using that pin as an input (with a 3K pull-up) and when it is connected to my circuit, the PIC won't program.

Why is this happening, and is there anyway to use this PGM pin??

Dave
PCM programmer



Joined: 06 Sep 2003
Posts: 21420

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PostPosted: Mon Nov 27, 2006 1:56 pm     Reply with quote

Quote:
By experimentation I found that the PGM pin is the culprit

Add NOLVP to your #fuses statement, as shown in the program
near the end of this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=25130&highlight=16f628+nolvp

In additon to that, you need to pull down the PGM pin to GND during
programming. You can use a 100 ohm resistor to ground for this.
This will override the 3K pullup. Then remove the 100 ohm resistor
after programming is done.
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