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H8/3002 Datasheet(PDF) 243 Page - Renesas Technology Corp |
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H8/3002 Datasheet(HTML) 243 Page - Renesas Technology Corp |
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243 / 700 page  8.4.10 External Bus Requests, Refresh Controller, and DMAC During a DMA transfer, if the bus right is requested by an external bus request signal ( BREQ) or by the refresh controller, 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 8-20 shows an example of the timing of insertion of a refresh cycle during a burst transfer on channel 0. Figure 8-20 Bus Timing of Refresh Controller and DMAC ø 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 229 |
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