Automatic detection, selection and configuration of clock...

Details Automatic detection, selection and configuration of clock... Automatic detection, selection and configuration of clock...

2005-05-31

2005-05-31

Shingleton, Michael B (Department: 2817)

Oscillators

Combined with particular output coupling network

C331S135000, C331S049000, C331S185000

Reexamination Certificate

active

06900701

ABSTRACT:
Oscillator circuitry on an integrated circuit automatically detects the presence or absence of an external resistor which is used to bias and set the frequency of an internal resistor-capacitor (RC) oscillator. If the resistor is present, the RC oscillator begins to oscillate to generate an oscillator clock. The presence of the oscillator clock is detected, and the RC oscillator continues to generate the oscillator clock. If the resistor is not present, the RC oscillator does not begin to oscillate. The absence of the oscillator clock is detected, and the oscillator circuitry automatically re-configures itself to generate the oscillator clock from an internal crystal oscillator circuit employing an external crystal.

REFERENCES:
patent: 3725681 (1973-04-01), Frederiksen
patent: 4949052 (1990-08-01), Chigira
patent: 6700872 (2004-03-01), Hann et al.
patent: 6731658 (2004-05-01), Inazumi et al.

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