Writing to EEPROM with an ICD-U40

dntccs · Joined: 30 Jul 2007 Posts: 2 Location: Ooltewah, TN

I have just purchased an ICD-U40 and have not been able to find an answer in previous forum questions. I have also searched the manual for the ICD and PCW and do not see an answer.

I need to write calibration data to the EEPROM of a 16F876 using the ICD. We are running PCW. I am able to program the device so I know the ICD is operating OK. The code compiles with 47% ROM, 57% RAM and A Stack of 2. If I place the #device ICD=TRUE in my code I get the message "Not Enough RAM for All Variables" message. I would prefer not to change the code since it is running OK in 50 devices.

I normally use an ICE2000 and am able to view the EEPROM data. I do not see a way to do this with the ICD-U40 (at least while in the program mode). Is there a way if I am not able to compile with the debugger code? Even if I can not view the data, is there a way to write it?

Thanks,

Dennis T.

newguy · Joined: 24 Jun 2004 Posts: 1903

Search the main forum for "#rom" and "eeprom". Here are a couple of examples:

http://www.ccsinfo.com/forum/viewtopic.php?t=25522&highlight=rom+0xf00000+int8
http://www.ccsinfo.com/forum/viewtopic.php?t=28175&highlight=rom+eeprom

In your code you place:

dntccs · Joined: 30 Jul 2007 Posts: 2 Location: Ooltewah, TN

I should have been more specific. I am already writing baseline calibration figures into EEPROM. I have been using an ICE to calibrate with while the board is in an environmental chamber. It is difficult to get the board situated in the chamber with the ICE just outside. I do not like having the device adapter for the ICE in the chamber between -20 and +70 deg C. The arrangement is also hard on the connecting cable between the adapter and the ICE. I could place the entire ICE in the chamber, but the processor module already runs pretty hot and it would have to be in close proximity to 2000 VDC.

What I would like to be able to accomplish is to have the PIC already in place on the board and write the required data to the EEPROM using the ICD instead of the ICE. This way when the board comes out of the chamber it is ready to be packaged.

Thanks,

Dennis T.

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

The Microchip ICD2 has a tab in the Programmer / Settings menu
in MPLAB that lets you set it to only program the data eeprom.
Within that tab, you can select the option for "Manually select memories
and ranges". Then you have a choice of the following tick boxes:
Select the one for EEPROM and only it will be programmed.