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7721 Datasheet(PDF) 451 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 451 Page - Renesas Technology Corp |
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451 / 577 page  APPLICATION 7721 Group User’s Manual 16–48 16.2 Examples of using DMA controller 16.2.2 Example of stepping motor control The following is an example where the slow-up or slow-down control for the stepping motor is performed by using DMA1, DMA2, and RTP0. (1) Specifications •DMA1 transfers the stepping motor’s phase output data from the phase output data table to the RTP0 pulse output data register. (Refer to “Figure 16.2.6” and “Table 16.2.1.”) •DMA2 transfers the step time for slow up or slow down from the timer A0 set value data table to the timer A0 register. (Refer to “Figure 16.2.6.”) After slow up or slow down is completed, a DMA2 interrupt occurs. •Phase output is performed by RTP0; pulse output mode 0 (Refer to “Figures 16.2.6 and 16.2.7.”) •After slow up or slow down is completed, the motor operates with the definite rate. M37721 ROM RTP0 Timer A0 Stepping motor Phase output data table DMAC1 DMAC2 Bus M Timer A0 set value data table Fig. 16.2.6 Example of stepping motor control |
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