Contents
What is the real lifetime of EEPROM Stack Exchange?
As you state, the internal EEPROM has a lifetime of 100,000 write cycles. This isn’t a guess – a very significant proportion of ATmega328 will reach this number with no issues. I have tested three processors before, and all reached 150,000 cycles with no issues.
Is there a boundary between EEPROM and volatile memory?
There is no clear boundary dividing the two, but the term “EEPROM” is generally used to describe non-volatile memory with small erase blocks (as small as one byte) and a long lifetime (typically 1,000,000 cycles).
Why does EEPROM have more die area than flash memory?
EEPROM occupies more die area than flash memory for the same capacity, because each cell usually needs a read, a write, and an erase transistor, while flash memory erase circuits are shared by large blocks of cells (often 512×8).
When does EEPROM see its first write error?
The EEPROM saw it’s first write error after 47 days and 1,230,163 cycles. This is an order of magnitude better than the spec on the atmel datasheet, but similar to the results of similar experiments. The magic solution – if you dont want to code what Cybergibbons said about reading before writing, is the EEPROM.update () function.
How is the EEPROM counter recoverable in a power failure?
Algorithm for Reliable Counter Recovery. The counter is primarily stored in RAM and written to EEPROM on every increment in order to be recoverable in the event of a power failure. Accordingly, the following algorithm is followed: 1. At power-up the counter is read from EEPROM and checked for any bit errors.
How is EEPROM different from the ram on an ATmega?
EEPROM is different to the RAM on an ATmega. Writing to it is not simple or quick, but it is wrapped up in a friendly Arduino library, hiding this complexity from the user. The first level of indirection is the EEPROM library, which is trivially simple], just calling two other functions for read and write.
How to emulate EEPROM in Flash without excessive erasing?
This is a really simple example, but it would work. It illustrates how EEPROM can be emulated in flash without excessive erasing by creating a ledger of value records. To look up the current data set values, find which flash page is current (one and only one flash page should have the header 0x5555FFFF).
Are there any algorithms for EEPROM Emulation?
There are probably many different algorithms to accomplish EEPROM emulation without forcing a lot of unnecessary writes. The main concept is like a ledger (except values don’t depend on previous values). The data set or a variable has many “records” in the ledger.
Is there a failure mode for EEPROM destroyer?
It is important to note the failure mode of EEPROM. Most “EEPROM destroyer” projects repeatedly read/write until the data is not written at all. Before this point, the EEPROM will still be damaged. This would be manifested by data not being retained for a reasonable period.