Combined crystal oscillator switching method suitable for humid environment

Abstract

The invention relates to a combined crystal oscillator switching method suitable for a humid environment. By arranging an external crystal oscillator and an internal crystal oscillator which are arranged side by side, the working environments of the external crystal oscillator and the internal crystal oscillator are detected by the equipment in stages, and the external crystal oscillator and the internal crystal oscillator are switched on the basis of the actual conditions of the working environments, so the external crystal oscillator and the internal crystal oscillator can normally work andwork under the optimal condition. According to the invention, a series of problems of equipment clock abnormity, ceaseless reset, fast power consumption, crash and the like caused by failure of an external crystal oscillator of the current equipment in a humid environment are solved; the mode of combining the inner crystal oscillator and the outer crystal oscillator is adopted as a processor crystal oscillator source; under the normal condition, the external crystal oscillator is adopted to improve the operation accuracy of the system, and when the external crystal oscillator fails, the internal crystal oscillator is intelligently switched to ensure the stable and reliable operation of the system.

Description

technical field [0001] The invention relates to the technical field of basic electronic circuits, in particular to a combined crystal oscillator switching method suitable for humid environments. Background technique [0002] Quartz crystal oscillators are high-precision and high-stability oscillators, which are widely used in various oscillating circuits such as color TVs, computers, remote controls, etc., as well as frequency generators in communication systems, generating clock signals for data processing equipment and Provides a reference signal, etc. for a particular system. [0003] At present, most MCU processors use an external crystal oscillator as the clock crystal oscillator source. When the device is installed outdoors or in a humid environment, the inside of the device is easily affected by high and low temperatures to form water vapor, which makes the external crystal oscillator damp and has a certain impact on the operation of the device. Influence, in fact, i...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems in the prior art that when the device is installed in a humid environment, the external crystal oscillator is prone to failure, which leads to the failure of the device to wake up, the failure of the system clock, the failure of the program to run, etc., and finally leads to the problem of the device crashing, and provides a An optimized combined crystal oscillator switching method suitable for humid environments