Watch dog timer system

Details Watch dog timer system Watch dog timer system

G - Physics

06

F

G06F 1/24 (2006.01) G06F 11/28 (2006.01) G06F 11/36 (2006.01)

Patent

CA 2292991

The invention provides a watch dog timer system which has an abnormality checking function of a high degree of reliability. In the watch dog timer system, abnormality of a computer system is detected as a variation of a value allocated in accordance with an execution condition of a program. To this end, a register receives execution state data defined in accordance with an execution condition of the program from a processor or CPU of the computer system and stores the execution state data before a counter of the watch dog timer system overflows. A comparator compares the execution condition data stored in the register and state sequence data indicative of a state sequence of the program stored in a ROM in advance with each other and generates a reset signal for resetting the computer system when the comparison reveals incoincidence.

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