| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique through which refresh operations suitable to a plurality of respective operating states that a semiconductor memory can take are performed. SOLUTION: A memory chip 200 starts a refresh operation in synchronism with a clock signal CLK supplied from an external device in an operation cycle after the generation of a refresh timing signal RFTM. Moreover, in a snooze state (a low power consumption state), a refresh operation is started in accordance with the generation of the signals RFTM regardless of the presence or absence of the signal.
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