DISPLAYING CONTROL DEVICE

摘要

PURPOSE:To prevent the displaying error when the address signals of the first and second respective address buses connected through the buffer are dissident by adding the address signal comparing means. CONSTITUTION:A latch means 12 reads and latches displaying data IDa-IDn of a memory 8 through a data bus 13 based upon a reading command signal RD and outputs through a data bus 14. An address signal comparing means 4 compares address signals ADa-ADn of the first address bus 2 and address signals ADa'-ADn' of the second address bus 9. When both address signals are dissident, an output prohibiting signal IS to prohibit the output of displaying data IDa-IDn for the latch means 12 is outputted. Thus, the displaying error can be prevented.