There are three configurable behaviors when the fault log is full:
1. Stop logging new faults.
2. Use FIFO mode, the oldest log is overwritten by the newest log.
3. Keep the first half number of logs unchanged; only the second half logs are in FIFO mode (not available on the UCD90320U, UCD90320 and UCD90240 devices).
For more FAQ please check the following document.
UCD90xxx Family Frequently Asked Questions and Answers
UCD9090 UCD9090A UCD90120 UCD90120A UCD90124 UCD90124A UCD90160 UCD90160A UCD90240 UCD90320 UCD90320U