| 摘要 |
PURPOSE: A unified device of an earphone jack and a USB jack are provided to reduce manufacturing costs by forming an earphone jack and a USB jack in a body. CONSTITUTION: A CPU controls two ICs by outputting a turn-on/off command to ICs by firmware setting. The CPU can block a signal to a USB. The CPU can also block a signal to an earphone jack. The switching mechanism is executed by firmware setting. As a result, a user can use a jack as a USB jack or an earphone jack.
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