| 摘要 |
A memory device for use with an external apparatus having a predetermined function is removably attached to the apparatus and comprises a connection portion for electrically removably connecting the memory device to the external apparatus; a memory portion for storing information supplied from the external apparatus through the connection portion so as to be accessible from the external apparatus, the memory portion being of a type which requires periodical refreshing of the stored information; a reproducing and holding circuit actuated in response to at least one predetermined signal supplied from the external apparatus through the connection portion to refresh the information stored in the memory portion; and an actuating circuit for actuating operation of the reproducing and holding circuit when the connection portion is electrically separated from the external apparatus, the actuating circuit including a power source for electrically energizing the reproducing and holding circuit and a signal generation circuit for generating, when the connection portion is separated from the external apparatus, a signal having the same function as that of the predetermined signal supplied from the external apparatus through the connection portion.
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