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H8/3028F Datasheet(PDF) 266 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 266 Page - Renesas Technology Corp |
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266 / 923 page  Rev. 2.00, 09/03, page 236 of 890 φ RD T1 T2 T1 T2 Td T1 T2 T1 T2 T1 T2 Td T1 T2 T1 T2 , DMAC cycle (channel 1) CPU cycle DMAC cycle (channel 0A) CPU cycle DMAC cycle (channel 1) Address bus HWR LWR Figure 7.19 Timing of Multiple-Channel Operations 7.4.10 External Bus Requests, DRAM Interface, and DMAC During a DMAC transfer, if the bus right is requested by an external bus request signal ( BREQ) or by the DRAM interface (refresh cycle), the DMAC releases the bus after completing the transfer of the current byte or word. If there is a transfer request at this point, the DMAC requests the bus right again. Figure 7.20 shows an example of the timing of insertion of a refresh cycle during a burst transfer on channel 0. φ RD HWR LWR , T1 T2 T1 T2 T1 T2 T1 T2 T1 T2 Td T1 T2 T1 T2 T1 T2 DMAC cycle (channel 0) DMAC cycle (channel 0) Refresh cycle Address bus Figure 7.20 Bus Timing of DRAM Interface, and DMAC |
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