Reset circuit and control method for embedded system

An embedded system and reset circuit technology, which is applied in the field of electronic components and circuits, can solve the problems of embedded control and processing systems that cannot work normally, and the system has poor real-time performance, and achieve the effect of reducing complexity and improving startup efficiency

Inactive Publication Date: 2004-07-07
ZTE CORP
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Problems solved by technology

Choosing a watchdog chip with a relatively large feeding time can avoid the dog feeding process when the system starts, but the real-time performance of the system is not good at this time. When the system has problems, it cannot be reset in time, which will affect communications, test equipment, and medical instruments. Embedded control and processing systems in various equipment and devices such as information appliances, information appliances, etc. cannot work normally

Method used

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  • Reset circuit and control method for embedded system
  • Reset circuit and control method for embedded system
  • Reset circuit and control method for embedded system

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Embodiment Construction

[0026] Below in conjunction with accompanying drawing, the implementation of the present invention is described in detail as follows:

[0027] exist figure 1 In the existing commonly used embedded circuit system, the reset input of the microprocessor is connected with the reset output of the watchdog. When the system is running normally, the connection between microprocessor (CPU) 2 and the I / O pin of the watchdog 1 chip will produce a level change at regular intervals, so that watchdog 1 can confirm that CPU2 is running normally; otherwise, the watchdog The circuit of dog 1 thinks that the program of CPU2 has run abnormally, and it will generate a reset level to reset CPU2. This interval should not be too long, otherwise the system software cannot be reset in time after a problem occurs. Since the time for the system to download the version through the network is much longer than the interval for feeding the dog, it is also hoped that the interval for feeding the dog is lon...

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Abstract

The method is as the follows: 1) on power and reset, low level reset signal outputted by watchdog to CPU; 2) interlinking for watchdog output and CPU input to be disconnected after reset level being lifted up; 3) programmable component to caunt reset times of watchdog and at the same time to detect variation of watchdog level; a) CPU being started up within time N to output dog feeding signal, watchdog output and CPU input to be connected to have system operated normally; b) other wise, system being reset after time T and 4) watchdog output being connected to CPU in normal operation at once soft reset of CPU and reset output being generated by watchdog after time T.

Description

technical field [0001] The invention belongs to the class of electronic components and circuits, in particular to a reset device for an embedded control and processing system. Background technique [0002] At present, embedded control and processing systems are more and more widely used in various fields such as communications, test equipment, medical instruments, and information appliances. With the continuous improvement of user needs, the functions of embedded systems are becoming more and more abundant, so that more and more storage units are occupied in the software version of the system, and the startup time of the system is lengthened. Since a large number of system software versions are usually downloaded from the server through the network after the system is initialized, the version quantity is large, and the download time is too long compared to the feeding time of the watchdog circuit, so the CPU needs to continuously feed the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F9/24
Inventor 赵宏伟王柯潘卫明
Owner ZTE CORP
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