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Control device for controlling a central processing unit on instantaneous voltage drop
| Details |
Inventors: Makino, Masayuki; Takenaka, Hidetoshi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Stephen; Steven L.
Assistant Examiner: Han; Y. Jessica
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
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. |
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DETAILED DESCRIPTION An object of the present invention is to provide a control device which is favorably capable of controlling a central processing unit without frequent occurrence of a waiting state in the central processing unit.
Another object of this invention is to provide a control device of the type described, which dispenses with the requirement for a large capacity of a back-up condenser so as to compensate the instantaneous voltage drop of the input voltage.
Other objects of this invention will become clear as the description proceeds.
On describing the gist of this invention, it is possible to understand that a control device is connected to a power source having a power source voltage and is for controlling a central processing unit in accordance with an input voltage which is applied to the central processing unit and which results from the power source voltage.
The central processing unit has a first terminal for receiving a first signal to make the central processing unit become a first state and a second terminal for receiving a second signal to make the central processing unit become a second state.
According to this invention, the control device comprises (1) input voltage applying means connected to the power source for applying the input voltage to the central processing unit, (2) first detecting means for detecting whether or not the power source voltage is lower than a first voltage to supply the first signal to the first terminal when the power source voltage is lower than the first voltage, and (3) second detecting means for detecting whether or not the input voltage is lower than a second voltage which is lower than the first voltage, the second detecting means supplying the second signal to the second terminal when the input voltage is lower than the second voltage.
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