Watch dog timer system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 3, 2001
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Dec 22, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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