Method and circuit for detecting a fault in a clock signal for microprocessor electronic devices including memory elements

a clock signal and microprocessor technology, applied in the field of circuits for detecting irregularities in clock signals of electronic devices, can solve problems such as malfunctions during normal use, unusable effects of devices, and failure to correctly reset new devices
USRE38154E1Inactive Publication Date: 2003-06-24STMICROELECTRONICS SRL
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
STMICROELECTRONICS SRL
Publication Date
2003-06-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

An electronic device including a microprocessor, a circuit generating a clock signal, and memories of both the volatile type and the non-volatile type, incorporates a circuit for generation of a reset signal capable of detecting a stop in the oscillation of said clock signal and generating a logic signal coupled with the reset input of the microprocessor. The circuit monitors the clock signal applied to the device and, if an irregularity is detected, generate a reset signal holding the microprocessor in a safe state. The reset signal is held until the circuit generating the clock signal resumes normal operation.
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Description

CROSS REFERENCE TO RELATED APPLICATIONThe present application is related to U.S. patent application Ser. No. 08 / 414,919 entitled "CIRCUIT FOR DETECTING A FAULT IN A CLOCK SIGNAL FOR MICROPROCESSOR ELECTRONIC DEVICES" filed of even date herewith by the inventors hereof and assigned to the assignee herein, and incorporated by reference herein.BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a circuit for detecting irregularities in a clock signal of electronic devices containing a microprocessor and non-volatile memory elements.The present invention concerns specifically two types of electronic device, to wit: microcontrollers containing EEPROM or FLASH EEPROM non-volatile memories, and FLASH EEPROM memories using internally a microprocessor for management of the reading, programming and erasing phases.The following description is given with reference to this field of application only for the purpose of simplifying discussion thereof.2. Description ...

Claims

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