Semiconductor device having a device state identifying circuit.

摘要

A semiconductor device comprises external terminals (Vcc, Vss, Ao), and a state identifying circuit (11). Information stored in the state identifying circuit is read out at the two external terminals (Vcc, Vss), when the potentials of the terminals (Vcc, Vss) are different and at a low level and when the potential of the third external terminal (Ao) is at a high level.