Micropressor monitoring and resetting circuit

Details Micropressor monitoring and resetting circuit Micropressor monitoring and resetting circuit

1989-12-05

1992-06-16

Beausoliel, Robert W.

Excavating

G06F 1100

Patent

active

051230186

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.

REFERENCES:
patent: 4488303 (1984-12-01), Abramovich
patent: 4541050 (1985-09-01), Honda
patent: 4586179 (1986-04-01), Sirazi
patent: 4625309 (1986-11-01), Nitschke
patent: 4868817 (1989-09-01), Shigihara
patent: 4879647 (1989-11-01), Yazawa
patent: 4964123 (1990-10-01), Umemoto

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