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eeprom erased on power-up

 
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rahul12



Joined: 27 Dec 2012
Posts: 1

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PostPosted: Thu Dec 27, 2012 12:27 am     Reply with quote
I am using PIC18F1320 and I write data to data eeprom (internal-256bytes) to store a fix 4bytes data.

My problem really is that when I turn-off the power and on it again... the data in the eeprom is erased or contains 0000.

Any help please...

Thanx
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rahul
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Thu Dec 27, 2012 6:27 am     Reply with quote
Hi,

Why on earth did you tack this (totally unrelated) question onto a 9 year old thread??

+++++++++++++
Fixed - made a new thread.

-Forum Moderator
+++++++++++++

Please post a complete and compilable test program that shows the problem.
We want to see how you are configuring the PIC, especially the Fuses. Please
also tell us your compiler version.

Please also tell us how the PIC is being powered, ie. what is the power supply?
Describe your circuit!

John
temtronic



Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario

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PostPosted: Thu Dec 27, 2012 6:50 am     Reply with quote
and please...tell us this is REAL hardware and NOT a 'simulation'...!!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Dec 27, 2012 3:22 pm     Reply with quote
Data EEPROM won't survive a software reset:
http://www.ccsinfo.com/forum/viewtopic.php?t=26937

After discharge and charge of source, EEPROM appears erased:
http://www.ccsinfo.com/forum/viewtopic.php?t=49339

This thread has several more links on data eeprom corruption:
http://www.ccsinfo.com/forum/viewtopic.php?t=37757
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