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PIC12F609-E/P Datasheet(PDF) 77 Page - Microchip Technology |
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PIC12F609-E/P Datasheet(HTML) 77 Page - Microchip Technology |
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77 / 212 page  2010 Microchip Technology Inc. DS41302D-page 77 PIC12F609/615/617/12HV609/615 9.11 Comparator Hysteresis Each comparator has built-in hysteresis that is user enabled by setting the CMHYS bit of the CMCON1 register. The hysteresis feature can help filter noise and reduce multiple comparator output transitions when the output is changing state. Figure 9-7 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 9-7: 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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