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PIC12F609-E/MDSQTP Datasheet(PDF) 65 Page - Microchip Technology |
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PIC12F609-E/MDSQTP Datasheet(HTML) 65 Page - Microchip Technology |
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65 / 168 page  © 2006 Microchip Technology Inc. Preliminary DS41302A-page 63 PIC12F609/615/12HV609/615 8.11 Comparator Hysteresis Each comparator has built-in hysteresis that is user enabled by setting the CMHYS bit of the CMCON1 reg- ister. The hysteresis feature can help filter noise and reduce multiple comparator output transitions when the output is changing state. Figure 8-7 shows the relationship between the analog input levels and digital output of a comparator with and without hysteresis. The output of the comparator changes from a low state to a high state only when the analog voltage at VIN+ rises above the upper hysteresis threshold (VH+). The output of the comparator changes from a high state to a low state only when the analog voltage at VIN+ falls below the lower hysteresis threshold (VH-). FIGURE 8-7: COMPARATOR HYSTERESIS – + VIN+ VIN- Output Note: The black areas of the comparator output represents the uncertainty due to input offsets and response time. VH- VH+ VIN- V+ VIN+ Output (Without Hysteresis) Output (With Hysteresis) |
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