Patent ID: 7555410

Claim:
A circuit for use by a multifunction handheld device that is coupleable to an audio output device, the multifunction handheld device including a color video display device and a host interface that is coupleable to a host device via a universal serial bus port, the circuit comprises: a processing module; a memory interface, operably coupled to the processing module and a memory that stores a plurality of digitally formatted files, and that stores operational instructions that cause the processing module to: receive a first digitally formatted file of the plurality of digitally formatted files from the host device when coupled to the host device via the host interface and store the first digitally formatted file in the memory, wherein the first digitally formatted file includes a compressed audio file; receive a second digitally formatted file of the plurality of digitally formatted files from a host device when coupled to the host device via a host interface and store the second digitally formatted file in the memory, wherein the second digitally formatted file includes a compressed video file; playback a selected one of the plurality of digitally formatted files, the playback including the generation of an audio output signal for the audio output device, when the first digitally formatted file is selected, and the playback including rendering the selected one of the digitally formatted files for the color video display device, when the second digitally formatted file is selected; power the handheld device from the host device when the handheld device is coupled to the host device via the host interface; monitor for a low voltage condition produced by a low battery voltage; when the low voltage condition is detected, enabling a first fail safe algorithm to: disable the output of the audio output signal; store at leant one audio setting; and shutdown the multifunction handheld device.