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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) 272 Page - Renesas Technology Corp |
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SH7041A датащи(HTML) 272 Page - Renesas Technology Corp |
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272 / 923 page  234 Figure 11.4 shows the changes in priority levels when transfer requests are issued simultaneously for channels 0 and 3, and channel 1 receives a transfer request during a transfer on channel 0. The DMAC operates in the following manner under these circumstances: 1. Transfer requests are issued simultaneously for channels 0 and 3. 2. Since channel 0 has a higher priority level than channel 3, the channel 0 transfer is conducted first (channel 3 is on transfer standby). 3. A transfer request is issued for channel 1 during a transfer on channel 0 (channels 1 and 3 are on transfer standby). 4. At the end of the channel 0 transfer, channel 0 shifts to the lowest priority level. 5. At this point, channel 1 has a higher priority level than channel 3, so the channel 1 transfer comes first (channel 3 is on transfer standby). 6. When the channel 1 transfer ends, channel 1 shifts to the lowest priority level. 7. Channel 3 transfer begins. 8. When the channel 3 transfer ends, channel 3 and channel 2 priority levels are lowered, giving channel 3 the lowest priority. Transfer request Channel waiting DMAC operation Channel priority Issued for channels 0 and 3 Issued for channel 1 0 > 1 > 2 > 3 Channel 0 transfer begins 1 > 2 > 3 > 0 Channel 0 transfer ends Channel 1 transfer begins Channel 3 transfer begins 2 > 3 > 0 > 1 Channel 1 transfer ends 0 > 1 > 2 > 3 Channel 3 transfer ends Change of priority Change of priority Change of priority None 3 3 1,3 Figure 11.4 Example of Changes in Priority in Round Robin Mode |
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