| 摘要 |
PURPOSE:To improve the erasing efficiency of an image memory by reading out data specified at its address from the image memory and then reading prescribed data within a period that the same address is specified. CONSTITUTION:Before reading out data from the image memory 3, a CPU2 sets up erasing data in a latch circuit 12 at first and then outputs a control signal IP and sets up an FF19. If a control signal MEM is inputted under said status, timing counter 15 starts to operate and data are read out from the memory 3 in accordance with a reading address and inputted to an output data latch circuit 14. A control signal WT is applied to the memory 3 during a specific period that the same address is specified after reading out data, and erasing data from the latch circuit 12 are written in the memory 3. |
