| 摘要 |
PURPOSE:To rapidly re-write a switch pattern and to attain the miniaturization of a memory capacity by dissolving and storing the switch pattern data into a master pattern memory and an address pointer memory. CONSTITUTION:In an address pointer memory 12, the address data of a master pattern memory 11 are stored, and the address data of the memory 11 stored in the memory 12 are successively read by a memory reducing control circuit 13. In accordance with the read address data, switch pattern data stored in the memory 11 are generated. Consequently, in the memory 12, the address of the necessary number of all switch patterns to be read for one frame circumference period from the memory 11 is stored. Thus, the memory capacity can be minimized. For the change of the switch pattern, only the address data of the memory 12 may be re-written or the pattern data of one place of the memory 11 may be re-written and therefore, the rapid change can be executed.
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