Power-on-reset and watchdog circuit and method
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United States of America Patent
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Dec 30, 1997
Grant Date -
N/A
app pub date -
Apr 17, 1996
filing date -
Sep 30, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power-on-reset and watchdog circuit is disclosed which employs discrete bipolar transistors to provide reset capability for microprocessors in the event of power-up or microprocessor malfunction. The present invention has a watchdog detection circuit which monitors a pulsed microprocessor output signal. As long as the watchdog detection circuit receives the pulsed microprocessor output signal, the microprocessor will not reset. In the event of microprocessor malfunction the pulsed microprocessor output signal will latch either high or low, initiating an oscillator circuit to reset the microprocessor. Upon power-up, the watchdog detection circuit will be forced into the off state for a specified amount of time so as to invoke the oscillator circuit, thereby resetting the microprocessor.
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