U8480 Series Remote Operation 1
U8480 Series Programming Guide 67
The condition bits are set and cleared under the following conditions:
Table 1-11 Bit change conditions for Device status
Bit number Definition EVENts causing bit changes
3 U8480 Series Error – SET: 
If the U8480 Series non-volatile memory has failed or other hardware has failed
– CLEARED: 
In every other condition