Embedded spaceborne computer watchdog circuit and embedded spaceborne computer system

Abstract

The invention discloses an embedded spaceborne computer watchdog circuit and an embedded spaceborne computer system. The watchdog circuit comprises a watchdog pulse width clearing counting circuit, adog bite frequency counting circuit, a watchdog signal clearing merging logic module, a resistance-capacitance network circuit and a watchdog counting circuit. The watchdog clearing pulse width counting circuit outputs a low level after receiving one write operation performed by the application software, the counter starts counting, the output is changed into a high level, and the output is changed into a low level after the watchdog clearing pulse width counting circuit is full, so that a high pulse signal for clearing a watchdog is generated; the watchdog clearing operation of the watchdog circuit is optimally designed, the frequency of the watchdog clearing operation of system software is reduced, and the running efficiency of the software is improved.

Description

technical field [0001] The invention belongs to the technical field of embedded on-board computers, in particular to an embedded on-board computer watchdog circuit and an embedded on-board computer system. Background technique [0002] The main function of the watchdog circuit is to monitor the running status of the product. When the product runs abnormally, the watchdog will bite the watchdog, and the product can be reset to restart the operation. [0003] The traditional on-board computer watchdog circuit design is composed of watchdog counting circuit 54HC4060, dog bite counting circuit 54HC164, clear watchdog signal merge logic module, RC network circuit, software write operation and so on. as attached figure 1 shown. [0004] Such as figure 2 As shown, because the traditional watchdog is cleared by software write operations, the system software needs to perform two write operations to complete one operation to clear the watchdog. At the same time, there are two read...

AI Technical Summary

Problems solved by technology

[0007] The present invention also provides an embedded on-board computer system, which improves the operating efficiency of the software, improves the reliability of the on-board computer products, and solves the problem of In the past, the watchdog in the system software cleared the problem that the watchdog function might fail after the watchdog operation was interrupted, which ensured the reliability and safety of the watchdog circuit, and can be used in aerospace, aviation, military, civil, etc. field

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