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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) 282 Page - Renesas Technology Corp |
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H8S/2214 Scheda tecnica(HTML) 282 Page - Renesas Technology Corp |
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282 / 936 page  Section 7 DMA Controller Rev.4.00 Sep. 18, 2008 Page 222 of 872 REJ09B0189-0400 Figure 7.9 illustrates operation in normal mode. Address TA Address BA Transfer Address TB Legend: Address Address Address Address Where : Address BB = LA = LB = LA + SAIDE ⋅ (–1)SAID ⋅ (2DTSZ ⋅ (N – 1)) = LB + DAIDE ⋅ (–1)DAID ⋅ (2DTSZ ⋅ (N – 1)) = Value set in MARA = Value set in MARB = Value set in ETCRA TA TB BA BB LA LB N Figure 7.9 Operation in Normal Mode Transfer requests (activation sources) are external requests and auto-requests. With auto-request, the DMAC is only activated by register setting, and the specified number of transfers are performed automatically. With auto-request, cycle steal mode or burst mode can be selected. In cycle steal mode, the bus is released to another bus master each time a transfer is performed. In burst mode, the bus is held continuously until transfer ends. |
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