| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To set next DMA transfer and to prevent object data of the set next DMA transfer from being overwritten before the transfer. <P>SOLUTION: A DMAC 20 includes current transfer setting registers 31 to 33 and next transfer setting registers 41 to 43. A transfer source address, a transfer destination address, and a transfer frequency of current DMA transfer are stored in current transfer setting registers 31 to 33 as current transfer settings. Transfer settings of DMA transfer to be performed after the completion of DMA transfer based on current transfer settings stored in the current transfer setting registers are stored in next transfer setting registers 41 to 43 as next transfer settings. A flag for controlling write is provided for each next transfer setting register. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
