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SH7021 Datasheet(PDF) 342 Page - Renesas Technology Corp |
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SH7021 Datasheet(HTML) 342 Page - Renesas Technology Corp |
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342 / 509 page  326 RENESAS When a compare match B occurs before the compare match A, the 0 data transfer can be performed before the 1 data transfer, so a non-overlapping waveform can be output. In such cases, be sure not to change the NDR contents until the compare match A after the compare match B occurs (non-overlap period). This can be ensured by writing the next data to the NDR using the IMIA interrupt service routine. The DMAC can also be started up using an IMIA interrupt. However, these write operations should be performed prior to the next compare match B. The timing is shown in figure 11.10. Compare match A Compare match B NDR DR NDR write NDR write 0/1 output 0 output NDR write disable period NDR write period 0/1 output 0 output NDR write disable period NDR write period Figure 11.10 Non-Overlap Operation and NDR Write Timing |
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