[SOLVED] ICD3 funny behaviour

[alan]

I am programming a dsPIC33EP512GM304 using a ICD3 (Burnt out my U64 ) and MPLABX 2.10 with CCS 5.025.

I have the following problem. When I connect the ICD to the board and power up I can't program unless I plug out (leave the power on) run the selftest using the ICD3 Test module and swap cables.

I am getting the error
"Target Device ID (0x0) does not match expected Device ID (0x1bc00000)"

Any ideas? I do not use the PGED3 and PGEC3 pins for anything else.

Regards

Battling to register on microchip forums that is why I post here.

[drh]

[Ttelmah]

I'd suspect power, or slightly too long cables (these get particularly critical with these chips).
Look at: <http://www.microchip.com/forums/m775940.aspx>

[alan]

Thanks Ttelmah.

As long as I don't take the programming cable out and leave the board powered, I can reprogram as many times as I want.

Also the I use the tag-connect and it is placed about 10mm from processor.
It only happens at power up.

Regards

[Ttelmah]

In the ICD3 menu, how is it set to power?.

You need to make sure "Power target circuit from ICD 3", is not selected.

I suspect your board draws more than the ICD3 can supply. If it is set to power the board, this then overloads it's supply. When you re-connect after the main board is powered, the supply restarts.

Best Guess....

[alan]

Not ticked, but gets interesting.

If I unplug the tag_connect at board level and then reconnect with board powered up can't program.
If I unplug the tag_connect at ICD side and reconnect can program.

Tried this about 5 times with consistent results as explained above.

At least I am making progress, hope so

Regards

[alan]

Soldered 10k resistors to Vcc on PGD and PGC lines and so far no problem.

Regards