| 摘要 |
A peripheral device reliably reports errors to a main device. When a control signal is received from the main device, an interface circuit requests a voltage detecting circuit to determine whether or not a main circuit section is operative. The voltage detecting circuit determines the capability of operation of the main circuit section based on the state of charge of a charging/discharging section, and outputs the results to the interface circuit. If determined to be operative, the interface circuit turns on a power supply switch to operate the main circuit section, while outputting the control signal received from the main device to the main circuit section. If inoperative, the interface circuit transmits to the main device a signal informing it of the inoperative state.
|
