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H8SX/1663 データシート(PDF) 422 Page - Renesas Technology Corp |
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H8SX/1663 データシート(HTML) 422 Page - Renesas Technology Corp |
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422 / 1158 page  Section 7 DMA Controller (DMAC) Rev.1.00 Jun. 07, 2006 Page 370 of 1102 REJ09B0294-0100 7.5.9 DMA Basic Bus Cycle Figure 7.23 shows an examples of signal timing of a basic bus cycle. In figure 7.23, 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 7.23 Example of Bus Timing of DMA Transfer |
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