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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) 261 Page - Renesas Technology Corp |
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H8/3028F 数据表(HTML) 261 Page - Renesas Technology Corp |
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261 / 923 page  Rev. 2.00, 09/03, page 231 of 890 Figure 7.15 shows an auto-requested burst-mode transfer. This example shows a transfer of three words from a 16-bit two-state access area to another 16-bit two-state access area. T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 φ RD , CPU cycle DMAC cycle Source address Destination address CPU cycle Td Address bus HWR LWR Figure 7.15 Burst DMA Bus Timing When the DMAC is activated from a DREQ pin there is a minimum interval of four states from when the transfer is requested until the DMAC starts operating. The DREQ pin is not sampled during the time between the transfer request and the start of the transfer. In short address mode and normal mode, the pin is next sampled at the end of the read cycle. In block transfer mode, the pin is next sampled at the end of one block transfer. |
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