Integrated circuit with clock generator

Details Integrated circuit with clock generator Integrated circuit with clock generator

1989-06-09

1990-06-05

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 17, 331 18, 331 25, H03L 708

Patent

active

049317482

ABSTRACT:
A microprocessor or other integrated circuit including a clock generator circuit which is dependent on an externally-provided reference signal includes the capability of detecting the loss of this externally-provided reference signal and producing an alternate clock signal despite the loss of the reference. In a particular embodiment, the clock generator comprises a phase locked loop frequency synthesizer which normally relies on an external crystal oscillator for its reference frequency signal. The generator includes a circuit for detecting abnormalities in the crystal signal and switching the voltage controlled oscillator of the frequency synthesizer to an internally-generated reference voltage. In the particular embodiment, the clock generator is also capable of producing a reset signal in response to the loss of the reference signal.

REFERENCES:
patent: 3676801 (1972-07-01), Musa

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