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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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H8SX/1663R 数据表(PDF) 461 Page - Renesas Technology Corp |
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H8SX/1663R 数据表(HTML) 461 Page - Renesas Technology Corp |
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461 / 1504 page  Section 10 DMA Controller (DMAC) Rev. 2.00 Sep. 24, 2008 Page 429 of 1468 REJ09B0412-0200 10.5.9 DMA Basic Bus Cycle Figure 10.23 shows an examples of signal timing of a basic bus cycle. In figure 10.23, data is transferred in words from the 16-bit 2-state access space to the 8-bit 3-state access space. When the bus mastership is passed from the DMAC to the CPU, data is read from the source address and it is written to the destination address. The bus is not released between the read and write cycles by other bus requests. DMAC bus cycles follows the bus controller settings. CPU cycle DMAC cycle (one word transfer) CPU cycle Address bus B φ T 1 T 2 T 1 T 2 T 3 T 1 T 2 T 3 Source address Destination address RD LHWR LLWR High Figure 10.23 Example of Bus Timing of DMA Transfer |
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