Embedded system fast start reset system and method based on MCU and watchdog

By dynamically adjusting the external watchdog reset timeout time through the auxiliary MCU and capacitor switching circuit, the problem of reset time mismatch in embedded systems is solved, realizing fast startup and fast reset in abnormal response, thus improving system adaptability and reliability.

CN121579247BActive Publication Date: 2026-06-02SHANDONG YOU INTERNET OF THINGS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG YOU INTERNET OF THINGS CO LTD
Filing Date
2025-10-31
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing embedded systems, the reset time of the external watchdog chip is not well matched with the processor startup time, resulting in slow system startup, inability to adapt to different hardware differences, and slow response to abnormal resets.

Method used

An auxiliary MCU and capacitor switching circuit are used to dynamically adjust the external watchdog reset timeout. The minimum startup time of the main processor is found through multiple reset tests, and the minimum watchdog feeding time is set during normal operation to ensure fast reset.

Benefits of technology

It achieves precise adaptation and rapid response of system startup time, improves the adaptability and reliability of embedded systems, adapts to different hardware differences, and shortens startup time and anomaly recovery time.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a fast starting reset system and method based on MCU and watchdog of an embedded system, and relates to the technical field of electronic communication.The system comprises a main processor, an external watchdog circuit, a capacitor switching circuit and an auxiliary MCU; the auxiliary MCU is in communication connection with the main processor and the external watchdog circuit; the input end of the capacitor switching circuit is connected with the control signal output end of the auxiliary MCU, and the output end thereof is connected with the CWD pin of the external watchdog circuit; the auxiliary MCU is used for selecting different capacitors to access the external watchdog circuit through the capacitor switching circuit in the system starting stage, so as to dynamically adjust the reset timeout of the external watchdog circuit, and find the minimum starting time of the main processor through multiple resets; after the system normally runs, the capacitor switching circuit is controlled to set the reset timeout of the external watchdog circuit as the minimum time ensuring that the main processor can normally feed the watchdog, so that the adaptability and reliability of the embedded system are comprehensively improved.
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