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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7041A датащи(PDF) 270 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 270 Page - Renesas Technology Corp |
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270 / 923 page  232 11.3.3 Channel Priority When the DMAC receives simultaneous transfer requests on two or more channels, it selects a channel according to a predetermined priority order, either in a fixed mode or in round robin mode. These modes are selected by priority bits PR1 and PR0 in the DMA operation register (DMAOR). Fixed Mode: In these modes, the priority levels among the channels remain fixed. The following priority orders are available for fixed mode: • CH0 > CH1 > CH2 > CH3 • CH0 > CH2 > CH3 > CH1 • CH2 > CH0 > CH1 > CH3 These are selected by settings of the PR1 and PR0 bits of the DMA operation register (DMAOR). Round Robin Mode: In round robin mode, each time the transfer of one transfer unit (byte, word or long word) ends on a given channel, that channel receives the lowest priority level (figure 11.3). The priority level in round robin mode immediately after a reset is CH0 > CH1 > CH2 > CH3. |
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