FIELD: physics, computer engineering.
SUBSTANCE: invention relates to portable computing devices which interact with accessories to provide power from the portable device to the accessory during hibernation of the portable computing device. A portable computing device (PCD) can selectively supply power to an accessory during PCD hibernation. The accessory can use the power supplied during PCD hibernation to detect user input events and wake the PCD from hibernation in response to a detected event.
EFFECT: high efficiency of controlling electrical power.
26 cl, 13 dwg
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