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M38042FEHKP 数据表(PDF) 121 Page - Renesas Technology Corp |
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M38042FEHKP 数据表(HTML) 121 Page - Renesas Technology Corp |
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121 / 387 page  1-103 REJ09B0212-0100Z Rev.1.00 Jan 14, 2005 3804 Group (Spec.H) HARDWARE FUNCTIONAL DESCRIPTION SUPPLEMENT A/D Converter A/D conversion is started by setting AD conversion completion bit to “0”. During A/D conversion, internal operations are performed as follows. 1. After the start of A/D conversion, AD conversion register goes to “0016”. 2. The highest-order bit of AD conversion register is set to “1”. and the comparison voltage Vref is input to the comparator. Then, Vref is compared with analog input voltage VIN. 3. As a result of comparison, when Vref < VIN, the highest- order bit of AD conversion register becomes “1.” When Vref > VIN, the highest-order bit becomes “0.” By repeating the above operations up to the lowest-order bit of the AD conversion register, an analog value converts into a digital value. In the 10-bit A/D mode, A/D conversion completes at 61 cycles of 2tc(XIN)* (15.25 µs at f(XIN) = 8.0 MHz) after it is started. In the 8- bit A/D mode, A/D conversion completes at 50 cycles of 2tc(XIN) (12.5 µs at f(XIN) = 8.0 MHz) after it is started. And the result of the conversion is stored into the AD conversion register. Concurrently with the completion of A/D conversion, the A/D con- version completion bit is set to “1” and an A/D conversion interrupt request occurs, so that the AD conversion interrupt request bit is set to “1”. * tc(XIN) = Main clock input cycle time When n = 0 Vref = 0 When n = 1 to 1023 Vref = ✕ n n : Value of A/D converter (decimal numeral) VREF 1024 ✽1–✽10: A result of the first to tenth comparison Table 22 Change of AD conversion register during A/D conversion (at 10-bit A/D mode) At start of conversion First comparison Second comparison Third comparison After completion of tenth comparison 0 0 VREF 2 ± ✽ Change of AD conversion register Value of comparison voltage (Vref) •• • •• • •• • Table 20 Relative formula for a reference voltage VREF of A/D converter and Vref (at 10-bit A/D mode) 0 0 0 0 000 0 0 10 0 00 0 0 0 0 0 10 0 0 0 0 0 0 0 1 ✽ 11 0 0 0 0 0 0 20 ✽ VREF 2 VREF 2 ± VREF 4 VREF 4 ± VREF 8 VREF 2 ± VREF 4 ± ••• ± VREF 1024 A result of A/D conversion ✽ 13 45 6 7 8 9 2 10 ✽✽ ✽ ✽ ✽ ✽✽ ✽ ✽ When n = 0 Vref = 0 When n = 1 to 255 Vref = ✕ (n – 0.5) n : Value of A/D converter (decimal numeral) VREF 256 Table 21 Relative formula for a reference voltage VREF of A/D converter and Vref (at 8-bit A/D mode) |
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