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SH7041A Datasheet(PDF) 299 Page - Renesas Technology Corp |
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SH7041A Datasheet(HTML) 299 Page - Renesas Technology Corp |
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299 / 923 page  261 Burst Mode, Single Address, and Edge Detection: In burst mode with single address and edge detection, DREQ sampling is conducted only on the first cycle. In figure 11.24, a dummy cycle is inserted, at the earliest, three cycles after the timing for the first sampling. During this period, data is undefined, and DACK is not output. Nor is the number of DMAC transfers counted. Thereafter, DMAC transfer continues until the data transfer count set in the DMATCR has ended. DREQ sampling is not conducted during this period. Therefore, DRAK is output on the first cycle only. When DMAC transfer is resumed after being halted by a NMI or address error, be sure to reinput an edge request. DRAK is output once, and the remaining transfer restarts after output of one dummy cycle. The DACK output period in burst mode is the same as in cycle steal mode. |
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