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DS80CH11 Datasheet(PDF) 47 Page - Dallas Semiconductor |
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DS80CH11 Datasheet(HTML) 47 Page - Dallas Semiconductor |
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47 / 88 page  DS80CH11 011200 47/88 A/D CONVERSION TIMES ( µS) PRESCALE SETTING 0.640 MHz 4.000 MHz 8.000 MHz 12.000 MHz 16.000 MHz 20.000 MHz 25.000 MHz 0 100.00 16.00 – – – – – 1 – 32.00 16.00 – – – – 2 – 48.00 24.00 16.00 – – – 3 – 64.00 32.00 21.33 16.00 – – 4 – 80.00 40.00 26.67 20.00 16.00 – 5 – 96.00 48.00 32.00 24.00 19.20 – 6 – – 56.00 37.33 28.00 22.40 17.92 7 – – 64.00 42.67 32.00 25.60 20.48 8 – – 72.00 48.00 36.00 28.80 23.04 9 – – 80.00 53.33 40.00 32.00 25.60 10 – – 88.00 58.67 44.00 35.20 28.16 11 – – 96.00 64.00 48.00 38.40 30.72 12 – – – 69.33 52.00 41.60 33.28 13 – – – 74.67 56.00 44.80 35.84 14 – – – 80.00 60.00 48.00 38.40 15 – – – 85.33 64.00 51.20 40.96 NOTES: 1. Conversion times given in microseconds ( µs) 2. ( – ) = not a usable setting 7.6 WINDOW COMPARATOR The window comparator allows software to identify a range of potential digital A/D results that are considered interesting. The window comparator will monitor each conversion result against user programmed selections. Results that meet the criteria will cause the comparator to set the WCM flag. By setting the WCQ bit, the end of conversion interrupt source is qualified so that only results which fall within the programmed range cause the interrupt. This feature allows software to ignore uninteresting results without actually reading the con- verter result. User software can select two 8–bit comparator values. These values will be compared against the most signifi- cant 8–bits of each A/D result, designated as ADR9–2. The user also can identify whether the target result is inside of the range bounded by the upper and lower limit or outside through programming of the WCIO bit. In practice, this allows the comparator to look for A/D results that are above a number, below a number, inside of a range, or outside of a range. The state of the WCM flag can be expressed by the following Boolean equa- tion: WCM = WCIO ⊕ (WINHI < ADR9–2) ⊕ (WINLO < ADR9–2) Figure 7–3 illustrates the ranges that can be examined using the window comparator. |
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