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PIC16LC620-04/SS 数据表(PDF) 38 Page - Microchip Technology |
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PIC16LC620-04/SS 数据表(HTML) 38 Page - Microchip Technology |
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38 / 108 page ![]() PIC16C62X DS30235G-page 38 Preliminary © 1998 Microchip Technology Inc. 7.1 Comparator Configuration There are eight modes of operation for the comparators. The CMCON register is used to select the mode. Figure 7-2 shows the eight possible modes. The TRISA register controls the data direction of the com- parator pins for each mode. If the comparator mode is changed, the comparator output level may not be valid for the specified mode change delay shown in Table 12-2. Note: Comparator interrupts should be disabled during a comparator mode change other- wise a false interrupt may occur. FIGURE 7-2: COMPARATOR I/O OPERATING MODES - + C1 VIN- VIN+ Off (Read as '0') RA0/AN0 RA3/AN3 A A CM<2:0> = 000 - + C2 VIN- VIN+ Off (Read as '0') RA1/AN1 RA2/AN2 A A - + C1 VIN- VIN+ Off (Read as '0') RA0/AN0 RA3/AN3 D D CM<2:0> = 111 - + C2 VIN- VIN+ Off (Read as '0') RA1/AN1 RA2/AN2 D D - + C1 VIN- VIN+ C1OUT RA0/AN0 RA3/AN3 A A - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A CM<2:0> = 100 - + C1 VIN- VIN+ C1OUT RA0/AN0 RA3/AN3 A A - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A From VREF Module - + C1 VIN- VIN+ C1OUT RA0/AN0 RA3/AN3 A D - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A CM<2:0> = 011 RA4 Open Drain - + C1 VIN- VIN+ C1OUT RA0/AN0 RA3/AN3 A D - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A CM<2:0> = 110 - + C1 VIN- VIN+ Off (Read as '0') RA0/AN0 RA3/AN3 D D CM<2:0> = 101 - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A - + C1 VIN- VIN+ C1OUT RA0/AN0 RA3/AN3 A A - + C2 VIN- VIN+ C2OUT RA1/AN1 RA2/AN2 A A CM<2:0> = 001 CIS=0 CIS=1 Comparators Reset Two Independent Comparators Two Common Reference Comparators One Independent Comparator Three Inputs Multiplexed to Two Common Reference Comparators with Outputs Four Inputs Multiplexed to Comparators Off Two Comparators Two Comparators CM<2:0> = 010 CIS=0 CIS=1 CIS=0 CIS=1 A = Analog Input, Port Reads Zeros Always D = Digital Input CIS = CMCON<3>, Comparator Input Switch |
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