Oscillation stop monitoring circuit of crystal oscillator
A technology of crystal oscillators and monitoring circuits, applied in power oscillators, hardware monitoring, electrical components, etc., can solve problems such as unstable performance, vibration stop failure, and low accuracy
Active Publication Date: 2015-08-12
JIANGSU HONGYUN TECH
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Problems solved by technology
The performance of the RC oscillator is stable, and generally there will be no vibration stop failure, but the accuracy is low; the crystal oscillator has high accuracy, but the performance is unstable, and the vibration stop failure will occur
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[0016] The clock output by the crystal oscillator has high precision and can provide a high-precision clock for the chip. However, the performance of the crystal oscillator is unstable and there will be a vibration stop failure. Therefore, it is necessary to add a stop vibration monitoring circuit of the crystal oscillator when designing the chip. When the crystal oscillator fails to stop vibration, the monitoring circuit sends a signal to stop the vibration, and the chip switches the clock to the clock output by the standby oscillator, so that the chip can continue to work normally.
[0017] The stop-vibration monitoring circuit of the crystal oscillator and the corresponding clock processing module can be collectively referred to as a clock security system, such as figure 1 shown. The clock security system includes crystal oscillator XO 100, crystal oscillator stop vibration monitoring circuit 304, interrupt processing module 301, special event processing module 305, clock s...
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The invention discloses a design method for an oscillation stop monitoring circuit of a crystal oscillator. The oscillation stop monitoring circuit comprises a monitoring circuit of the oscillator; the monitoring circuit is used for monitoring circuit start and stop condition control, system clock treatment after oscillation stop of the oscillator, an interrupt signal sent for treatment after oscillation stop of the oscillator and a clock fault signal sent by the monitoring circuit. <0}{0><}0{>The monitoring circuit monitors whether the crystal oscillator is in normal operation or not; when the crystal oscillator has an oscillation stop fault, a corresponding clock of a chip is switched to a standby clock, an interrupt signal is sent to a processor, and simultaneously the monitoring circuit sends out a clock fault signal used for handling with other special events. <0}{0><}0{>The start and stop of the monitoring circuit can be controlled by virtue of software, so that the monitoring circuit is flexible to use; the output clock of the on-chip oscillator is fully utilized, so that the monitoring circuit has the characteristic of rapid clock switching; furthermore, the monitoring circuit is capable of sending different oscillation stop signals for different modules, so that the control precision for each module is improved.
Description
technical field [0001] The invention discloses a method for designing a vibration stop monitoring circuit of a crystal oscillator, relates to the design of digital circuits in integrated circuits, and belongs to the field of microelectronic technology and application. Background technique [0002] Oscillators can be divided into RC oscillators, LC oscillators and crystal oscillators. RC oscillators and crystal oscillators are commonly used in chips. The performance of the RC oscillator is stable, and generally there will be no vibration stop failure, but the accuracy is low; the crystal oscillator has high precision, but the performance is unstable, and the vibration stop failure will occur. Generally, in integrated circuit design, the crystal oscillator is used as an off-chip oscillator, and the RC oscillator is used as an on-chip oscillator. The software can choose to use the off-chip crystal oscillator or the on-chip RC oscillator. Due to the unstable performance of the ...
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IPC IPC(8): G06F11/30H03B5/02
Inventor 刘勇陶建平王和国韩景通孙振玮
Owner JIANGSU HONGYUN TECH