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

Images