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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) 352 Page - Renesas Technology Corp |
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H8S/2224 Scheda tecnica(HTML) 352 Page - Renesas Technology Corp |
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352 / 1071 page  Section 8 DMA Controller (DMAC) Rev. 5.00 Aug 08, 2006 page 266 of 982 REJ09B0054-0500 Figure 8.28 shows a transfer example in which TEND output is enabled and word-size single address mode transfer (read) is performed from external 8-bit, 2-state access space to an external device. DMA read φ Address bus DMA read DMA read DMA dead RD TEND DACK Bus release Bus release Bus release Bus release Last transfer cycle Figure 8.28 Example of Single Address Mode (Word Read) 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. |
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