EEProm specifications usually include a write cycle count which express the number of times a RAM address can be written reliably. When storing data carefully, it usually isn't changed often and so these counts don't often factor over the expected life of the product.

However, if your micro is changing the values a 100 times a second, you could reasonably exceed its capability. This is why static RAM is treated differently than EEProm. Put your most infrequently changed data in EEProm and calculate how long it would be until the write abilities would be exhausted.

There are a few applications where this would be ok but generally its not a great idea if you intend to use the RAM for temporary registers or highly dynamic storage.

-Jay C. Box