Oscillators – Plural oscillators – Selectively connected to common output or oscillator...
Patent
1999-04-23
2000-12-05
Mis, David
Oscillators
Plural oscillators
Selectively connected to common output or oscillator...
331 74, 331108D, 331143, 331158, 331173, 327298, H03B 500, H03B 520, H03B 530, H03B 2800
Patent
active
061572659
ABSTRACT:
A programmable multi-scheme clocking circuit supports multiple applications. In one implementation, the clocking circuit includes multiple clock sources such as a crystal oscillator, a RC oscillator, an internal oscillator, and an external clock. Each of the clock sources can be enabled by a respective control signal. A multiplexer couples to the clock sources and provides a clock signal from one of the clock sources as the output clock signal. External support circuitry (e.g., external tank circuits) for some of the clock sources (e.g., the crystal oscillator and the RC oscillator) can be coupled to the clocking circuit through one or more device pins. The pins to support the crystal oscillator, the RC oscillator, and the external clock signal are shared so that no additional device pins are required.
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Albert Philip H.
Fairchild Semiconductor Corporation
Mis David
LandOfFree
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