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US 2014/0240010 A1Published application
Clock circuit for a microprocessor
AssigneeBlackBerry Limited
InventorsMark A.J. CARRAGHER, John William WYNEN
Life of this patent
Estimating the term…
Abstract
A mobile communication device includes an analog clock and a digital clock circuit. The analog clock circuit is configured to generate an oscillating output. The digital clock circuit is configured to generate a digital clock output having a frequency that is substantially equal to the frequency of the oscillating output.
Claims20
An electronic device comprising:
- a clock circuit configured to generate a first clock output;
- a frequency divider configured to generate a second clock output by frequency dividing a timing signal;
- a controller configured to:
- in response to a clock select signal being in a first state, enable the first clock output as a clock signal;
- and
- in response to the clock select signal changing from the first state to a second state:
- wait for an edge of the first clock output,
- upon occurrence of the edge of the first clock output, wait for an edge of the timing signal, and
- upon occurrence of the edge of the timing signal, switch from the first clock output being enabled as the clock signal to the second clock output being enabled as the clock signal.
6 more elements
A method performed by an electronic device, the method comprising:
- generating a first clock output;
- generating a second clock output by frequency dividing a timing signal;
- in response to a clock select signal being in a first state, enabling the first clock output as a clock signal;
- and
- in response to the clock select signal changing from the first state to a second state:
- waiting for an edge of the first clock output,
- upon occurrence of the edge of the first clock output, waiting for an edge of the timing signal, and
- upon occurrence of the edge of the timing signal, switching from the first clock output being enabled as the clock signal to the second clock output being enabled as the clock signal.
5 more elements
Dependencies are inferred from the claim text.