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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/2214 Scheda tecnica(PDF) 294 Page - Renesas Technology Corp |
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H8S/2214 Scheda tecnica(HTML) 294 Page - Renesas Technology Corp |
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294 / 936 page  Section 7 DMA Controller Rev.4.00 Sep. 18, 2008 Page 234 of 872 REJ09B0189-0400 (2) Full Address Mode (Cycle Steal Mode) Figure 7.17 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. DMA read φ 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 Figure 7.17 Example of Full Address Mode (Cycle Steal) Transfer Either a one-byte or a one-word transfer is performed for each transfer request, and after the transfer the bus is released. While the bus is released one bus cycle is inserted 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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