Watchdog reset circuit for serial counting and working method

A reset circuit and watchdog technology, applied in data reset devices, counting mechanisms/items, calculations, etc., can solve problems such as unfavorable counting cycle expansion, and achieve the effect of saving circuit area and optimizing circuit area.

Active Publication Date: 2021-03-09
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the system needs different first watchdog counting periods according to the degree of voltage abnormality, the disadvantages of this parallel counting structure are more obvious, and it is not conducive to the expansion of the counting period

Method used

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  • Watchdog reset circuit for serial counting and working method
  • Watchdog reset circuit for serial counting and working method
  • Watchdog reset circuit for serial counting and working method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present invention provides a serial counting watchdog reset circuit, its structure is as follows figure 1 As shown, it includes a reference module, a voltage sampling module, a comparator, a clock module, a watchdog counting module, a logic control module, and an output module. The voltage sampling module and the reference module are respectively connected to the same direction and reverse input terminals of the comparator A0; the first input terminal IN0 of the logic control module is connected to the output terminal of the comparator, and the second input terminal IN0 is connected to the output terminal of the comparator. The terminal IN1 is connected to the input signal in, and the third input terminal IN2 is connected to the output terminal of the watchdog counting module; the first output terminal out0 of the logic control module is connected to the input terminal of the output module; the second output terminal out1 is connected to The input terminal of the cl...

Embodiment 2

[0039] The present invention also provides a working method of a serial counting watchdog reset circuit, the process of which is as follows: image 3 shown, including the following steps:

[0040] Step 1. The circuit is powered on and started. When the voltage VCC meets the design requirements, the overall circuit starts to work normally after power-on reset. When the power is turned on, the first watchdog counting cycle WT1 is T1·T2·T3·T4·T5;

[0041] Step 2. After power-on reset, the watchdog counting module starts counting, and the first watchdog counting period is WT1;

[0042] Step 3. When the count reaches WT1, the circuit enters normal counting, and the counting period is switched to WT2;

[0043] Step 4. When the circuit is working normally, the voltage VCC has an abnormal disturbance. When the disturbance makes VCC not meet the design requirements, the degree of VCC disturbance determines the logic signal of A0 and A1. Set WT1 through A0 and A1. After the disturbance...

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Abstract

The invention discloses a watchdog reset circuit for serial counting and a working method, and belongs to the field of power management. On the basis of a reset circuit capable of prolonging the firstwatchdog counting period after the system is stabilized when abnormal disturbance occurs to the voltage, the length of the first watchdog counting period after the system is stabilized is flexibly set according to the abnormal degree of the voltage. The larger the abnormal degree of the voltage is, the longer the first watchdog counting period is after the system is stabilized; the watchdog counting module is of a series structure, on the premise that the number of counting modules is not increased, multiple watchdog counting periods are controlled and switched for the first time, and meanwhile the circuit area is optimized and saved.

Description

technical field [0001] The invention relates to the technical field of power management, in particular to a reset circuit capable of selecting a watchdog period and automatically switching the watchdog period. Background technique [0002] The power-on reset circuit is an indispensable part of the system. In the initial stage of the system, it provides a reset signal inside the chip to ensure that the entire system can start normally. [0003] The main function of watchdog reset is to prevent system damage caused by program running away. In the case of power-on or large voltage disturbance, the first watchdog counting period WT1 (hereinafter referred to as the first watchdog counting period) after the system voltage stabilizes is usually dozens of times longer than the traditional watchdog counting period WT2 even bigger. When the voltage is abnormal, the first watchdog counting period after the system is stable can be extended. This reset circuit is widely used in microsy...

Claims

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Application Information

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IPC IPC(8): G06F11/07G06F1/24G06M1/272
CPCG06F1/24G06F11/0757G06M1/272
Inventor张勇
Owner58TH RES INST OF CETC