Watchdog timer
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United States of America Patent
Stats
-
Dec 2, 1986
Grant Date -
N/A
app pub date -
Nov 29, 1984
filing date -
Nov 29, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A self-checking timer usable with a host system includes a clock and a plurality of interconnected counters. During a power-up phase the timer generates a system reset signal and counts the counters in a predetermined sequence. A flip-flop is set and reset during the power-up phase and inhibits generation of the system reset signal. During a normal operating phase, the timer generates a test signal that must be responded to by the host system to continuously inhibit generation of the system reset signal.
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