Clock circuit for a microprocessor
AssigneeResearch In Motion Limited
InventorsMark A. J. Carragher, John W. Wynen
Life of this patent
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Abstract
A wireless communication device is described having a transmitter that generates electromagnetic interference when operating in a transmit mode. The wireless communication device comprises a clock circuit including a first clock element configured to generate a first clock output, and a second clock element configured to generate a second clock output. Also included is a controller configured to switch between the first clock output and the second clock output when the transmitter is operating in the transmit mode.
Claims10
A method of maintaining oscillation of a crystal oscillator in a mobile device, comprising:
- detecting an edge of a clock circuit signal;
- enabling a digital clock circuit when the edge is detected;
- and
- driving the crystal oscillator with the digital clock circuit;
- wherein outputs of the digital clock circuit and the crystal oscillator have substantially equivalent frequencies.
A mobile communication device, comprising:
- a crystal oscillator;
- a sensor for detecting an edge of a clock circuit signal;
- and
- a controller for enabling a digital clock circuit when the edge is detected;
- wherein the digital clock circuit drives the crystal oscillator;
- wherein outputs of the digital clock circuit and the crystal oscillator have substantially equivalent frequencies.
Dependencies are inferred from the claim text.