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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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H8SX/1663R 数据表(PDF) 471 Page - Renesas Technology Corp |
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H8SX/1663R 数据表(HTML) 471 Page - Renesas Technology Corp |
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471 / 1504 page  Section 10 DMA Controller (DMAC) Rev. 2.00 Sep. 24, 2008 Page 439 of 1468 REJ09B0412-0200 10.5.11 Bus Cycles in Single Address Mode (1) Single Address Mode (Read and Cycle Stealing) In single address mode, one byte, one word, or one longword of data is transferred at a single transfer request and after the transfer the bus is released temporarily. One bus cycle or more by the CPU or DTC are executed in the bus released cycles. In figure 10.34, the TEND signal output is enabled and data is transferred in bytes from the external 8-bit 2-state access space to the external device in single address mode (read). Bus released Bus released Bus released DMA read cycle DMA read cycle DMA read cycle DMA read cycle B φ Address bus Bus released Bus released Last transfer cycle RD TEND DACK Figure 10.34 Example of Transfer in Single Address Mode (Byte Read) |
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