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7906 Datasheet(PDF) 313 Page - Renesas Technology Corp |
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7906 Datasheet(HTML) 313 Page - Renesas Technology Corp |
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313 / 531 page  A-D CONVERTER 7906 Group User’s Manual Rev.2.0 12-18 12.6 Comparator function By setting the ANi pin comparator function select bit (See Figure 12.2.5.) to “1,” the comparator function can be selected for each pin ANi. For pin ANi where the comparator function is selected, the following comparison operation is performed. ➀ A 10-bit value (a set value), of which high-order 8 bits consist of the corresponding A-D register i (at an even-numbered address)’s contents and of which low-order 2 bits = “102,” is D-A converted. ➁ The result of the D-A conversion (that is to say, comparison voltage Vref) is compared with an analog voltage input from an analog input pin. ➂ The value to be stored into the ANi pin comparator result bit (see Figure 12.2.6.) depends on the comparison result as follows: When Vref > analog input voltage, “0” is stored. When Vref < analog input voltage, “1” is stored. 12.6 Comparator function |
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