Precision crystal oscillator circuit used in microcontroller
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United States of America Patent
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-
May 13, 2003
Grant Date -
N/A
app pub date -
Apr 25, 2001
filing date -
Oct 26, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A microcontroller is disclosed that includes a crystal oscillator circuit that is programmable to provide multiple different levels of startup current. In the present embodiment, the crystal oscillator circuit includes logic devices for receiving programming indicating one of a plurality of different startup current levels and a resistor chain. The logic devices are coupled to the resistor chain for controlling the resistance of the oscillator circuit such that, upon receiving programming indicating a particular startup current level, the crystal oscillator circuit generates a corresponding startup current. In addition, the crystal oscillator circuit includes provision for selecting one of a plurality of different levels of capacitance. Furthermore, the crystal oscillator circuit includes a pass gate that includes circuitry for assuring predetermined startup conditions are met. A feedback loop that includes an amplifier provides for steady-state operations that have low power consumption.
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