| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the power consumption of a peripheral device connected to an external bus having a power line. <P>SOLUTION: A signal line monitoring part is activated to monitor the status of a signal line included in an external bus. In a peripheral device of the invention, a signal line monitor is activated to monitor the status of a signal line included in an external bus. In response to detection of signal absence on the signal line, the peripheral device stops power supply from the power supply device to a primary device. Power supply from the power supply device to the signal line monitor is maintained or stopped, in response to supply or stop of electric power via a power line included in the external bus. When there is no signal transmission via the external bus, power supply to the primary device is cut off. The cut-off of power supply via the power line in the external bus leads to the cut-off of even the power supply to the signal line monitor. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
