| 摘要 |
To provide an electronic circuit device that can change a characteristic after package sealing and that achieves a reduction in miscellaneous tasks during characteristic setting. The electronic circuit device includes: a burst detecting circuit (7) for detecting, from an input and output terminal (4), a prescribed write activation burst having a length that is larger than or equal to a prescribed time; a signal-pattern detecting circuit (9) for putting a serial interface (8) into an input-enable state in which setting data can be input, when the write activation burst is detected; and a volatile memory (10) and a nonvolatile memory (11) for storing, in the input-enable state, a setting-data signal input from the input and output terminal (4). An operation state of a functional circuit (6) is set in accordance with the setting data written in the volatile memory (10) or the nonvolatile memory (11). |
