| 摘要 |
PURPOSE:To refresh without fail even when a microprocessor is not operated by controlling a sequence so as to refresh a memory at the interval of the constant time even when an access request is not generated. CONSTITUTION:When an presence and absence of a memory request access signal 119 from a memory access request generating part 112 is decided and an access request is not generated, a refreshing mode is obtained, and a dynamic memory control circuit 111 supplies to a refreshing signal, an address selecting part 16 and a dynamic memory part 110. The selecting part 116 selects a refreshing address from the circuit 111, the memory part 110 is accessed and the refreshing is executed. Each time one processing of the refreshing is executed, the presence and absence of the signal 119 is decided, and in case of presence, the signal returns to an access mode. By the sequence control, the dynamic memory can be refreshed without fail and automatically even when the microprocessor is not operated.
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