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| From: | Dave Hansen |
| Subject: | Slightly OT: AVR EEPROM Location 0 (was RE: [avr-gcc-list] address@hidden ... what is it for ?!) |
| Date: | Tue, 6 Jan 2009 16:35:51 -0500 |
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From: address@hidden [...] > Notice the starting address of eeprom is 1 byte above the physical > address of start of eeprom because there was some rumor stating some > models of AVR would accidentally trash the first byte under some > circumstances. Perhaps when the rest of the device was wiped for a code > reload or something? Anyway, it was cheaper to do without the first byte > than to worry about it. More than a rumor. If you cut power to certain AVR parts during a write to EEPROM, location 0 would be corrupted. Documented in various AVR Errata sheets. Limited primarily to the AT90S parts IIRC. But it was a long while before I started using EEPROM address 0 again... Regards, -=Dave It’s the same Hotmail®. If by “same” you mean up to 70% faster. Get your account now. |
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