5.1.9 UpdateExtra Command

The UpdateExtra command is used to update the UpdateExtra and UpdateExtraAdd bytes, bytes 84 and 85 respectively, in the Configuration zone. These bytes can only be updated by this command. These bytes are one-time updatable bytes and can only be updated if the current value is 0x00. Trying to update this byte if the value is not 0x00 will result in an error.

For the ATECC608B-TNGTLS device, the UpdateExtraAdd byte (byte 85) has been configured to be an alternate I²C address.