Excavating
Patent
1993-04-01
1995-03-21
Stephen, Steven L.
Excavating
371 66, G06F 1100
Patent
active
054003415
ABSTRACT:
In a control device for controlling a CPU 11 in accordance with an input voltage which is applied to the CPU and which results from a power source voltage, a first detecting circuit 16 produces a first detection signal when the power source voltage is lower than a first voltage. Responsive to the first detection signal, a switching circuit 21 stops supply of the input voltage to the CPU and the CPU assumes to a waiting state. A condenser 15 discharges an electric voltage in order to compensate a drop of the input voltage. When the input voltage is lower than a second voltage which is lower than the first voltage, a second detecting circuit 17 produces a second detection signal to make the CPU become a reset or an initial state.
REFERENCES:
patent: 4234920 (1980-11-01), Van Ness et al.
patent: 4370723 (1983-01-01), Huffman et al.
patent: 4761824 (1988-08-01), Saito
patent: 4908523 (1990-03-01), Snowden et al.
"Betriebsspannungskontrolle fur Einchip-Mikrorechner", Radio Fernsehen Elektronik, vol. 38, No. 8, 1989, Berlin DD pp. 498-499.
Makino Masayuki
Takenaka Hidetoshi
Han Y. Jessica
NEC Corporation
Stephen Steven L.
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