checking the datasheet:

http://www.atmel.com/dyn/produ...rt_id=2806

Atmel apparently states on page 7, note 1:

twr is the time from a valid stop condition to the end of the internal write/clear cycle.

I read this as: If a byte to be written has been received, it takes twr time to actually program this byte in eeprom. So I would assume that you have to wait twr time between consecutive writes. Oh by the way, Atmel saids in the same application note that twr is 5 ms Max. (on page 5 of same document).

Now this is for an Atmel part. I do not know if this applies to other manufacturers. You will have to check their applictaion notes.

regards

Patrick