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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8SX1663 Scheda tecnica(PDF) 399 Page - Renesas Technology Corp |
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H8SX1663 Scheda tecnica(HTML) 399 Page - Renesas Technology Corp |
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399 / 1158 page  Section 7 DMA Controller (DMAC) Rev.1.00 Jun. 07, 2006 Page 347 of 1102 REJ09B0294-0100 7.5.2 Transfer Modes (1) Normal Transfer Mode In normal transfer mode, one data access size of data is transferred at a single transfer request. Up to 4 Gbytes can be specified as a total transfer size by DTCR. DBSR is ignored in normal transfer mode. The TEND signal is output only in the last DMA transfer. The DACK signal is output every time a transfer request is received and a transfer starts. Figure 7.7 shows an example of the signal timing in normal transfer mode and figure 7.8 shows the operation in normal transfer mode. Read Write Read Write DMA transfer cycle Last DMA transfer cycle Bus cycle Auto request transfer in dual address mode: External request transfer in single address mode: TEND DMA DMA DREQ Bus cycle DACK Figure 7.7 Example of Signal Timing in Normal Transfer Mode |
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