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HD6432351 데이터시트(PDF) 313 Page - Renesas Technology Corp |
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HD6432351 데이터시트(HTML) 313 Page - Renesas Technology Corp |
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313 / 1025 page ![]() Section 7 DMA Controller (DMAC) Rev. 3.00 Sep 15, 2006 page 279 of 988 REJ09B0330-0300 Figure 7.34 shows an example of single address transfer using the write data buffer function. In this example, the CPU program area is in on-chip memory. φ Internal address Internal read signal RD DACK External address DMA read DMA single CPU read DMA single CPU read Figure 7.34 Example of Single Address Transfer Using Write Data Buffer Function When the write data buffer function is activated, the DMAC recognizes that the bus cycle concerned has ended, and starts the next operation. Therefore, DREQ pin sampling is started one state after the start of the DMA write cycle or single address transfer. 7.5.13 DMAC Multi-Channel Operation The DMAC channel priority order is: channel 0 > channel 1, and channel A > channel B. Table 7.13 summarizes the priority order for DMAC channels. Table 7.13 DMAC Channel Priority Order Short Address Mode Full Address Mode Priority Channel 0A Channel 0 High Channel 0B Channel 1A Channel 1 Channel 1B Low |
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