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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) 343 Page - Renesas Technology Corp |
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H8S/2225 数据表(HTML) 343 Page - Renesas Technology Corp |
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343 / 1071 page  Section 8 DMA Controller (DMAC) Rev. 5.00 Aug 08, 2006 page 257 of 982 REJ09B0054-0500 8.5.9 DMA Transfer (Dual Address Mode) Bus Cycles Short Address Mode: Figure 8.19 shows a transfer example in which TEND output is enabled and byte-size short address mode transfer (sequential/idle/repeat mode) is performed from external 8-bit, 2-state access space to internal I/O space. DMA read Address bus RD LWR TEND HWR Bus release Last transfer cycle DMA write DMA dead DMA read DMA write DMA read DMA write Bus release Bus release Bus release φ Figure 8.19 Example of Short Address Mode Transfer A byte or word transfer is performed for a single transfer request, and after the transfer, the bus is released. While the bus is released, one or more bus cycles are executed by the CPU or DTC. In the transfer end cycle (the cycle in which the transfer counter reaches 0), a one-state DMA dead cycle is inserted after the DMA write cycle. In repeat mode, when TEND output is enabled, TEND output goes low in the transfer end cycle. Full Address Mode (Cycle Steal Mode): Figure 8.20 shows a transfer example in which TEND output is enabled and word-size full address mode transfer (cycle steal mode) is performed from external 16-bit, 2-state access space to external 16-bit, 2-state access space. |
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