Semiconductor memory device having refreshing function

摘要

The semiconductor memory device of the invention has a refresh timer for generating a refresh clock, a refresh executing circuit for sequentially refreshing a plurality of memory cells part by part on the basis of the cycle of the refresh clock, and a refreshing control circuit disposed between the refresh timer and the refresh executing circuit, for stopping transmission of the refresh clock from the refresh timer to the refresh executing circuit in a predetermined period during which the cycle of the refresh clock is easy to become unstable. With the configuration, an erroneous operation of the refresh executing circuit can be prevented.