A dynamic semiconductor memory device having a refresh-address generator, includes an initial resetting circuit for resetting the output signals of a refresh-address counter when the power supply is turned on, thereby eliminating the need for counter checking procedures prior to the examination of the refresh-address generator.
A printer/copier which stores job image data in memory before reproduction has a "refresh period" after which data stored therein will degrade if the device is not refreshed. Upon completion of a "security" job, DRAM refresh and normal read or write operations are disabled for a time period sufficient to allow the data resident in the DRAM to degrade.
