Micropressor monitoring and resetting circuit
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United States of America Patent
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Jun 16, 1992
Grant Date -
N/A
app pub date -
Dec 5, 1989
filing date -
Dec 5, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided an efficient circuit which monitors micropressor operation and directs a reset signal to the microprocessor in the event of malfunction. The status monitor circuit operates by maintaining a capacitor charge with a status pulse from the microprocessor. The base of a transistor is controlled by this charged capacitor, such that the transistor switches OFF when the charge is drained and the absence of a status signal is indicated. When the transistor is switched OFF a reset pulse is enabled to the microprocessor. To provide the reset signal, a transformed AC line voltage is applied to the base of a second transistor to switch it ON and OFF in synchronization with the line frequency.
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