| 摘要 |
PURPOSE:To execute effective data transfer by transferring changed data to a copy memory prior to transfer based upon the indication of a period pointer at the change of the data. CONSTITUTION:Nomally, datay ''0'' in a data holding memory 3 is transferred to the copy memory 4 side at a period ''1''. The memory 4 side compares the data ''0'' writes it in the memory 4. At a period 2, data ''1'' on the memory 3 is transferred to the memory 4 side and the memory 4 side writes the data ''1'' on the memory 4. Thereafter, the contents of the memory 3 are successively transferred and stored to/in the memory 4 similarly in accordance with respective periods. If data ''x'' is updated at a period 4, the periodical transfer is temporally stopped the data''x'' is instantaneously transferred. Then, data ''3'', ''4''...''n'' are transferred at periods 5, 6,...(n+1) respectively. Consequently, the rapid response is provided to the updated data and the merit of periodical transfer can be obtained. |
