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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8S/2225 数据表(PDF) 335 Page - Renesas Technology Corp |
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H8S/2225 数据表(HTML) 335 Page - Renesas Technology Corp |
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335 / 1071 page  Section 8 DMA Controller (DMAC) Rev. 5.00 Aug 08, 2006 page 249 of 982 REJ09B0054-0500 Figure 8.12 illustrates operation in normal mode. Address T A Address B A Transfer Address T B Legend: Address Address Address Address Where : Address B B = L A = L B = L A + SAIDE ( 1)SAID (2DTSZ (N 1)) = L B + DAIDE ( 1)DAID (2DTSZ (N 1)) = Value set in MARA = Value set in MARB = Value set in ETCRA T A T B B A B B L A L B N Figure 8.12 Operation in Normal Mode Transfer requests (activation sources) are external requests and auto-requests. With auto-request, the DMAC is only activated by register setting, and the specified number of transfers are performed automatically. With auto-request, cycle steal mode or burst mode can be selected. In cycle steal mode, the bus is released to another bus master each time a transfer is performed. In burst mode, the bus is held continuously until transfer ends. |
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