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PIC16F688-I/ML датащи(PDF) 60 Page - Microchip Technology |
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PIC16F688-I/ML датащи(HTML) 60 Page - Microchip Technology |
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60 / 204 page ![]() PIC16F688 DS41203E-page 58 © 2009 Microchip Technology Inc. 7.3 Comparator Control The CMCON0 register (Register 7-1) provides access to the following comparator features: • Mode selection • Output state • Output polarity • Input switch 7.3.1 COMPARATOR OUTPUT STATE Each comparator state can always be read internally via the associated CxOUT bit of the CMCON0 register. The comparator outputs are directed to the CxOUT pins when CM<2:0> = 110. When this mode is selected, the TRIS bits for the associated CxOUT pins must be cleared to enable the output drivers. 7.3.2 COMPARATOR OUTPUT POLARITY Inverting the output of a comparator is functionally equivalent to swapping the comparator inputs. The polarity of a comparator output can be inverted by set- ting the CxINV bits of the CMCON0 register. Clearing CxINV results in a non-inverted output. A complete table showing the output state versus input conditions and the polarity bit is shown in Table 7-1. TABLE 7-1: OUTPUT STATE VS. INPUT CONDITIONS Input Conditions CxINV CxOUT VIN- > VIN+ 00 VIN- < VIN+ 01 VIN- > VIN+ 11 VIN- < VIN+ 10 Note: CxOUT refers to both the register bit and output pin. |
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