Circuit for automatically detecting off-chip, crystal or on-chip

Details Circuit for automatically detecting off-chip, crystal or on-chip Circuit for automatically detecting off-chip, crystal or on-chip

1993-10-13

1994-11-29

Grimm, Siegfried H.

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

331 59, 331 64, 331108D, H03B 534, H03K 1756

Patent

active

053693779

ABSTRACT:
A self-configurable clock circuit which automatically detects at power up whether an off-chip crystal oscillator is connected to an integrated circuit including the self-configurable clock circuit, and following such detection generates a system clock signal and a power on reset signal to be used by other circuitry included in the integrated circuit. If the off-chip crystal oscillator is connected to the integrated circuit, then the self-configurable clock circuit provides the system clock signal from a first signal generated from the off-chip crystal oscillator. On the other hand, if the off-chip crystal oscillator is not connected to the integrated circuit, then the self-configurable clock circuit provides the system clock signal from a second signal generated from an on-chip RC oscillator circuit.

REFERENCES:
patent: 5093633 (1992-03-01), Benhamida
patent: 5151613 (1992-09-01), Satou et al.

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