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slsslssls
Joined: 17 Mar 2009
Posts: 6
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| 16f877a internal eeprom problem??? |
 Posted: Tue Mar 17, 2009 10:00 am |
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hi,
I am trying to use internal eeprom on 16f877a. There is no problem on proteus, but my circuit is not working true.
Data that I wrote on eeprom is being erased when power off.
How can this be? |
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Guest
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| Posted: Tue Mar 17, 2009 10:17 am |
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Hi,
How do you know it's not working correctly? Is the rest of your hardware working?
Post some complete sample code, and your compiler version.
Jeff |
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slsslssls
Joined: 17 Mar 2009
Posts: 6
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| Posted: Tue Mar 17, 2009 10:30 am |
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For example,
When I compile this code:
| Code: | write_eeprom(1,'2');
lcd_putc(read_eeprom(1)); |
I can see 2 on LCD.
Then I erase -- write_eeprom(1,'2') -- and I can't see 2 on display.
I had written to eeprom '2'. How can it be erased?? I can't understand this. I couldn't solve the problem. :( |
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Ttelmah
Guest
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| Posted: Tue Mar 17, 2009 10:54 am |
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If you erased "write_eeprom(1,'2')", then presumably you _erased_, and reprogrammed the chip. EEPROM will be erased as well, unless you tell your programmer not to do this...
Best Wishes |
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slsslssls
Joined: 17 Mar 2009
Posts: 6
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| Posted: Tue Mar 17, 2009 10:59 am |
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| How can I tell the programmer not to do this?? |
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slsslssls
Joined: 17 Mar 2009
Posts: 6
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| Posted: Tue Mar 17, 2009 12:52 pm |
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Now, there is no problem!  |
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