Watchdog circuit capable of configuring dog-feeding cycle

Abstract

The invention discloses a watchdog circuit capable of configuring a dog-feeding cycle. The watchdog circuit comprises a counting pulse generating module and a counting module connected with the counting pulse generating module; the input end of the counting pulse generating module is connected with a MCU dog-feeding signal output end and used for receiving a dog-feeding signal sent by the MCU; the output end of the counting module is connected with a MCU reset signal input end and used for sending a reset signal to the MCU; different output ends of the counting module are connected to the MCU reset signal input end according to the difference of the dog-feeding cycles needing to be configured. The watchdog circuit can automatically set the watchdog feeding cycle, and can avoid the condition that a mater chip is continuously reset to enter the infinite loop in the starting process due to short dog-feeding cycle; and meanwhile, the delay requirement of the product on the market is satisfied.

Description

technical field [0001] The invention relates to a watchdog circuit, in particular to a watchdog circuit with a configurable dog feeding cycle, which belongs to the field of electronic products. Background technique [0002] With the increasing integration of electronic products, the self-abnormality judgment function of the product is becoming more and more important. The watchdog is already a basic peripheral circuit to ensure the abnormal self-recovery of the product. [0003] In normal operation, the main chip will continue to give a reset signal - commonly known as feeding the dog, so that the watchdog will continue to re-time to ensure that it will not output a reset signal. Generally, the counting period of the watchdog is within 2S, for example, the counting period of SP706 is 1.6S. Once the MCU does not give a clear signal within 1.6S, for example, the chip is working abnormally, the watchdog will send a reset signal to make the chip reset actively, so as to achieve...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the feeding cycle of the existing watchdog circuit is too short, the present invention provides a watchdog circuit with a configurable feeding cycle, which can adjust the feeding cycle according to the actual situation, so that the watchdog starts or delays when the main chip starts. The main chip will not be reset under special circumstances

Images