Patent ID: 8880752

Claim:
A method implemented in an electronic device, the method comprising: in response to detecting a connection of pins of a device universal serial bus (USB) connector to corresponding pins of a USB connector of an accessory, configuring an accessory usage setting of the electronic device to correspond to the accessory being in a first operational mode of a plurality of operational modes; in response to a request to change an operational mode of the accessory to a second operational mode among one or more alternate operational modes of the plurality of operational modes: generating a voltage level change on a first signal line corresponding to a single pin of the USB pins of the device's USB connector to communicate to the accessory that a change in a present operational mode of the accessory is being initiated; and modifying the accessory usage setting of the electronic device when the accessory is in the second operational mode, to enable the electronic device to utilize one or more functional features associated with the second operational mode of the accessory.