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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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H8/3028F 数据表(PDF) 259 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 259 Page - Renesas Technology Corp |
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259 / 923 page  Rev. 2.00, 09/03, page 229 of 890 7.4.8 DMAC Bus Cycle Figure 7.13 shows an example of the timing of the basic DMAC bus cycle. This example shows a word-size transfer from a 16-bit two-state access area to an 8-bit three-state access area. When the DMAC gets the bus from the CPU, after one dead cycle (Td), it reads from the source address and writes to the destination address. During these read and write operations the bus is not released even if there is another bus request. DMAC cycles comply with bus controller settings in the same way as CPU cycles. φ RD HWR LWR T1 T2 T1 T2 Td T1 T2 T1 T2 T3 T1 T2 T3 T1 T2 T1 T2 CPU cycle DMAC cycle (1 word transfer) CPU cycle Source address Destination address Address bus Figure 7.13 DMA Transfer Bus Timing (Example) |
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