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H8SX/1663R Datasheet(PDF) 548 Page - Renesas Technology Corp |
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H8SX/1663R Datasheet(HTML) 548 Page - Renesas Technology Corp |
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548 / 1504 page  Section 11 EXDMA Controller (EXDMAC) Rev. 2.00 Sep. 24, 2008 Page 516 of 1468 REJ09B0412-0200 (2) Single Address Mode (Write in Cycle Steal Mode) In single address mode, the bus is released after one byte, word, or longword has been transferred in response to one transfer request. While the bus is released, one or more CPU, DMAC, or DTC bus cycles are initiated. Figure 11.35 shows an example of transfer when ETEND output is enabled, and byte-size, single address mode transfer (write) is performed from an external device to external 8-bit, 2-state access space. Bus release Bus release EXDMA write B φ Address bus Bus release Bus release Last transfer cycle ETEND EDACK EXDMA write EXDMA write EXDMA write LLWR Bus release Figure 11.35 Example of Single Address Mode (Byte Write) Transfer |
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