Clock system

Details Clock system Clock system

1996-03-04

1997-04-22

Pascal, Robert

Oscillators

Plural oscillators

Selectively connected to common output or oscillator...

327292, 3649344, G06F 108

Patent

active

056232349

ABSTRACT:
A clock system (2) for providing a system clock signal at a clock output (4) for use by a processing unit comprises a first oscillator circuit (6) which is enabled in response to a wake up signal provided by the processing unit to provide a first clock signal (RINGO CLOCK) at an output, and a second oscillator circuit (8) comprising a PLL (14) and an oscillator (16). The second oscillator (8) circuit provides a second clock signal (PLL CLOCK) and a lock signal (LOCKED) at first and second outputs respectively when the PLL is locked. The clock system (2) further comprises control circuitry (10) coupled to the output of the first oscillator circuit (6) and to the first and second outputs of the second oscillator circuit (8) for coupling the first clock signal (RINGO CLOCK) to the clock output (4) to provide the system clock signal or when the control circuitry (10) receives the lock signal (LOCKED) for coupling the second clock signal (PLL CLOCK) and not the first clock signal (RINGO CLOCK) to the clock output (4) to provide the system clock signal.

REFERENCES:
patent: 5155840 (1992-10-01), Niijima
patent: 5196810 (1993-03-01), Graether et al.

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