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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8S/2224 Scheda tecnica(PDF) 344 Page - Renesas Technology Corp |
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H8S/2224 Scheda tecnica(HTML) 344 Page - Renesas Technology Corp |
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344 / 1071 page  Section 8 DMA Controller (DMAC) Rev. 5.00 Aug 08, 2006 page 258 of 982 REJ09B0054-0500 DMA read Address bus RD LWR TEND HWR Bus release Last transfer cycle DMA write DMA read DMA write DMA read DMA write DMA dead Bus release Bus release Bus release φ Figure 8.20 Example of Full Address Mode Transfer (Cycle Steal) 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 bus cycle is 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. Full Address Mode (Burst Mode): Figure 8.21 shows a transfer example in which TEND output is enabled and word-size full address mode transfer (burst mode) is performed from external 16- bit, 2-state access space to external 16-bit, 2-state access space. |
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