Controllable watchdog replacement system

A watchdog and reset terminal technology, applied in data reset devices, instruments, electrical digital data processing, etc., can solve the problems of watchdog malfunction, system malfunction, and fast battery power consumption, so as to improve reliability and reduce power consumption. System power consumption and the effect of improving service life

Active Publication Date: 2008-10-08
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the watchdog reset and dog feed signals are directly connected to the corresponding pins of the MCU, when the system power supply VCC is powered off and the MCU is powered by a battery, the battery will be directly introduced into the watchdog IC through the pins of the watchdog chip, or through The inside of the MCU, the MCU pin, and the internal diode or pull-up resistor of the watchdog IC pin are connected to the system power supply VCC to supply power to the en

Method used

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  • Controllable watchdog replacement system
  • Controllable watchdog replacement system

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Embodiment Construction

[0014] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0015] see figure 1 , watchdog reset system of the present invention, comprises watchdog circuit, microprocessor MCU, is the system power supply VCC of watchdog circuit and microprocessor power supply, and battery 5B, and prior art difference is, sees An isolation circuit is connected between the watchdog circuit and the MCU. When the system power supply is normal, the isolation circuit can transmit the reset signal of the watchdog circuit reset pin RESET pin to the microprocessor reset terminal MCLR pin, and the microprocessor The dog feeding signal of the device I / O pin is transmitted to the watchdog circuit feeding dog pin WDI pin; when the MCU enters sleep mode or the system is shut down, and the system power fails, the isolation circuit is cut off, cutting off the watchdog circuit and the micro The electrical connection between processors ensures eff...

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Abstract

The invention relates to a controllable watchdog reset system, comprising a watchdog circuit and a microprocessor, and a system power supplying power for the watchdog circuit and the microprocessor. An isolation circuit is connected between the watchdog circuit and the microprocessor. When the system power normally supplies power, the isolation circuit transmits a reset signal of a reset pin of the watchdog circuit to a reset terminal of the microprocessor, and transmits a feeding-dog signal of I/O pin of the microprocessor to a feeding-dog pin of the watchdog circuit; when the system power is outage, the isolation circuit stops to cut off the contact between the watchdog circuit and the microprocessor. The invention has the effects of reducing system power dissipation, improving the service life of battery, and at the same time precluding a system reset problem caused by working wrongly of the watchdog circuit, and greatly improving reliability of the system.

Description

technical field [0001] The present invention relates to systems with watchdog reset circuits. Background technique [0002] At present, in some systems with a watchdog reset circuit, the commonly used method is to directly connect the watchdog reset signal and the dog feeding signal to the corresponding pins of the microprocessor (MCU), and the connection between the MCU and the watchdog circuit is not necessary. Isolated. In order to ensure that the MCU can be woken up in real time after the sleep mode or the system is shut down, when the MCU enters the sleep mode or the system is shut down, the system power supply VCC is powered off. At this time, a battery (5B in Figure 2) is usually used to power the MCU. Since the watchdog reset and dog feed signals are directly connected to the corresponding pins of the MCU, when the system power supply VCC is powered off and the MCU is powered by a battery, the battery will be directly introduced into the watchdog IC through the pins...

Claims

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Application Information

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IPC IPC(8): G06F1/24G06F11/00
Inventor 刘铁铸罗旭
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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