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H8SX1663 データシート(PDF) 432 Page - Renesas Technology Corp |
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H8SX1663 データシート(HTML) 432 Page - Renesas Technology Corp |
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432 / 1158 page  Section 7 DMA Controller (DMAC) Rev.1.00 Jun. 07, 2006 Page 380 of 1102 REJ09B0294-0100 7.5.11 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 7.34, 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 7.34 Example of Transfer in Single Address Mode (Byte Read) |
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