Clocking system for microcontrollers

Details Clocking system for microcontrollers Clocking system for microcontrollers

1999-07-28

2000-12-26

Follansbee, John A.

Electrical computers and digital processing systems: support

Clock, pulse, or timing signal generation or analysis

713400, G06F 112, G06F 104

Patent

active

06167527&

ABSTRACT:
An improved clocking system for micro controllers is provided. The micro controller has two mechanisms by which the clocking is provided. One clock is provided by an external clock signal which is generally crystal controlled. A second mechanism for providing the clock is also present. This second clock can be useful as the "primary" or first clock which is generally a crystal oscillator may take several milliseconds to stabilize following a restart from a stop mode. The second clock mechanism can for example be an internal ring oscillator or other type of clock which although not as accurate as a crystal clock does not require the several milliseconds to recover.

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patent: 4864162 (1989-09-01), Maoz
patent: 5237699 (1993-08-01), Little et al.
patent: 5355397 (1994-10-01), Hanson et al.
patent: 5382921 (1995-01-01), Estrada et al.
patent: 5473271 (1995-12-01), Little et al.

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