Data processing apparatus having DRAM incorporated therein

A semiconductor integrated device comprising on one semiconductor substrate an image processor in which logic circuits, a display controller and a change-over switch are integrated and an image memory in which drawing information is stored, wherein:

• said image memory includes a plurality of memory modules and each memory module allotted with a same row address and are inputted with a common control signal corresponding to a number of said memory modules;
• and
• said change-over switch arranged such that said logic circuits and said display controller are across the change-over switch from said plurality of memory modules, and serves to supply data from said display controller to one of said plurality of memory modules and serves to supply read-out data from one of said plurality of memory modules which are not accessed by said the controller to said display controller.