Patent ID: 8253545

Claim:
A An electronic device, comprising: a remote control for generating different wireless signals; and a host communicating with the remote control, the host comprising: a processor; a control panel for generating different key signals, the control panel comprising a key for generating a locking signal and an unlocking signal; a receiving unit for transferring the different key signals from the control panel to control the processor, and further for transferring the different wireless signals from the remote control to control the processor; and a locking unit connected between the key and the processor, the locking unit for generating the locking signal when the key is switched on, and further for generating an unlocking signal when the key is switched off, wherein the locking unit comprises a power supply, a resistor, a first capacitor, and a second capacitor; one terminal of the resistor is electrically connected to the power supply and the other terminal of the resistor is electrically connected to the processor; one terminal of the first capacitor is electrically connected to the power supply and the resistor to form a first node, the other terminal of the first capacitor is electrically grounded; one terminal of the second capacitor is electrically connected to the processor and the resistor to form a second node, the other terminal of the second capacitor is electrically grounded, one terminal of the key is electrically connected to the second node, and the other terminal of the key is electrically grounded; wherein the processor disables the receiving unit according to the locking signal and enables the receiving unit according to the unlocking signal.