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7721 Datasheet(PDF) 279 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 279 Page - Renesas Technology Corp |
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279 / 577 page  7721 Group User’s Manual 12–28 A-D CONVERTER 12.9 Precautions for A-D converter 12.9 Precautions for A-D converter 1. Writing to the following must be performed before a trigger occurs (while the A-D converter halts). •Each bit (except bit 6) of the A-D control register •Each bit of the A-D sweep pin select register _____ 2. When an external trigger is selected, the AN7/ADTRG pin is disconnected from the comparator. Therefore, this pin cannot be used as an analog input pin. When the AN7 pin is selected as an analog input pin while an external trigger is selected, the A-D converter operates, however, an undefined value is stored into the A-D register 7. 3. Refer to “Appendix. 8 Countermeasure against noise” when using the A-D converter. |
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