Anti-interference equipment of embedded system
An embedded system and device technology, applied in the field of communication, can solve the problems of the system not being reset, unable to monitor the system power supply, unable to reset the system normally, etc., to improve reliability, reduce implementation costs, and increase flexibility and reliability. Effect
Active Publication Date: 2009-01-14
HUAWEI TECH CO LTD
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Problems solved by technology
The main manifestations are: the internal integrated digital watchdog is an all-digital watchdog, which cannot monitor the abnormality of the system power supply, so the system cannot be reset normally; some abnormalities may also cause the system not to be reset, such as when the main clock of the chip is lost , the watchdog cannot work, and the system cannot be reset; when the CPU is configured with a watchdog, when a program exception occurs, the CPU has the risk of turning off the WDT (Watch Dog Timer, watchdog timer) function
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Embodiment Construction
[0021] The embodiment of the present invention provides an anti-interference device, such as image 3 As shown, it includes: a power-on reset unit 10 , a watchdog timer 20 , a clock generation unit 30 , and a control unit 40 .
[0022] The power-on reset unit (POR) 10 is used for generating a reset signal when the power supply is abnormal, such as when the chip is powered on or the power supply voltage decreases, and provides the reset signal to the control unit 40;
[0023] The watchdog timer (WDT) 20 is used to preset a threshold value, when the count reaches the threshold value, an overflow signal is output and sent to the control unit 40;
[0024] The clock generation unit 30 is used to provide a clock signal independent of the CPU for the built-in device of the anti-interference device, so that when the clock signal of the CPU is abnormal, the watchdog circuit of the embodiment of the present invention will not be affected. In the embodiment of the invention, the clock g...
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The embodiment of the invention discloses an anti-jamming device, comprising: a watchdog timer, which is used for presetting a threshold value, and when the count reaches the threshold value, outputting an overflow signal to a control unit; the control unit, which comprises a configuration control circuit and a reset control circuit, wherein, the configuration control circuit is used for the configuration of the watchdog timer by the CPU and the reset control circuit is used for sending a reset signal to the CPU when the watchdog timer overflows; and an electrification reset unit, which is used for generating the reset signal, in case of power supply abnormality, and providing the reset signal to the control unit. In the invention, the SOC internal watchdog circuit is independent from the CPU clock and combined with a POR circuit to improve the reliability, can supersede the special watchdog chip in the system, thus reducing the system implementation cost; in addition, the device of the invention maintains the configurable property of internal watchdogs, thus improving the flexibility and the reliability of system configuration.
Description
technical field [0001] The present invention relates to the technical field of communication, in particular to an anti-interference device in an embedded system. Background technique [0002] A watchdog circuit is commonly used in embedded systems for anti-interference, and the watchdog circuit includes a counter and a control circuit. When the embedded system is working normally, the CPU (Central Processing Unit) of the embedded system clears the counter of the watchdog circuit at regular intervals, which is called feeding the dog. Under normal circumstances, the embedded system feeds the dog. The time interval is less than the overflow time of the counter, the watchdog chip will not reset the embedded system, and the embedded system can work normally. When the system is abnormal, the CPU of the embedded system cannot perform the dog feeding operation normally. After the dog feeding time, the counter overflows, and the embedded system is forced to reset, restart and run no...
Claims
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IPC IPC(8): G06F11/00G06F1/24
Inventor 黄久松
Owner HUAWEI TECH CO LTD