Electrically powered portable medium
First Claim
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1. An electrically powered portable medium, comprising:
- a battery in the medium for supplying electric power to the medium;
detecting means, responsive to electric power received from the battery only once for a prescribed limited time after said medium is activated and before said medium is used, for comparing a voltage of the battery with a predetermined threshold level; and
a central processing unit for controlling said detecting means and for processing data, at least a portion of said data being provided to said medium by an external device.
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Abstract
An IC card which is substantially a portable medium incorporates data memory and control element composed of CPU. This IC card is provided with a keyboard and a display. In addition, IC card also incorporates a calender circuit which is constantly operated by internal battery, and battery checking circuit which causes resistor and Zener diode to generate a reference voltage. Battery checking circuit allows current to flow through the system constituents only when the power switch is activated for operating IC card. To implement power-saving operation of the system, semiconductor switches are installed between the internal battery and the battery checking circuit.
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Citations
15 Claims
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1. An electrically powered portable medium, comprising:
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a battery in the medium for supplying electric power to the medium; detecting means, responsive to electric power received from the battery only once for a prescribed limited time after said medium is activated and before said medium is used, for comparing a voltage of the battery with a predetermined threshold level; and a central processing unit for controlling said detecting means and for processing data, at least a portion of said data being provided to said medium by an external device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrically powered portable medium, comprising:
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a control element for processing data supplied to the medium; display means responsive to the control element for displaying data; a battery mounted in the medium for supplying electric power to the control element and the display means; and detecting means, responsive to electric power received from the battery only once for a prescribed limited time after said medium is activated and before said medium is used, for comparing the voltage of the battery with a predetermined threshold level. - View Dependent Claims (12)
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13. An electrically powered portable medium, comprising:
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a battery in the medium for supplying electric power to the medium; detecting means, responsive to electric power received from the battery only once for a prescribed limited time after said medium is activated and before said medium is used, for comparing the voltage of the battery with a predetermined threshold level; a central processing unit (CPU) for processing data; and means for generating a clock signal corresponding to actual time, the medium having a plurality of operational modes, including a HALT mode wherein the clock signal is not supplied to the CPU, and an ON mode wherein the clock signal is supplied to the CPU.
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14. An electrically powered portable medium, comprising:
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a battery in the medium for supplying electric power to the medium; detecting means responsive to electric power received from the battery only once for a prescribed limited time for comparing the voltage of the battery with a predetermined threshold level, the detecting means including circuit means for comparing the voltage of the battery with the predetermined threshold level for the limited time only after said medium is activated and before said medium is used; and a central processing unit for controlling an operation of said detecting means and for processing data, at least a portion of said data being provided to said medium by an external device.
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15. An electrically powered portable medium, comprising:
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a control element for processing data supplied to the medium; display means responsive to the control element for displaying data; a battery mounted in the medium for supplying electric power to the control element and the display means; and detecting means responsive to electric power received from the battery only once for a prescribed limited time for comparing the voltage of the battery with a predetermined threshold level, the detecting means including circuit means for comparing the voltage of the battery with the predetermined threshold level for the limited time only after said medium is activated and before said medium is used.
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Specification