Slave circuit having a data transmission interface (2) for processing data frames; an address register (10) for storing an address; a comparator (13) for comparing the address stored in the address register (10) with an address transmitted to the data transmission interface (2) in a data frame; an indicator register (16) which indicates the initialization of the slave circuit (1) if the address transmitted to the data transmission interface (2) in the slave circuit (1) is identical to a predetermined initialization address (UIA) for the slave circuit (1).