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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F87 датащи(PDF) 122 Page - Microchip Technology |
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PIC16F87 датащи(HTML) 122 Page - Microchip Technology |
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122 / 230 page  PIC16F87/88 DS30487D-page 122 2002-2013 Microchip Technology Inc. 13.1 Comparator Configuration There are eight modes of operation for the compara- tors. The CMCON register is used to select these modes. Figure 13-1 shows the eight possible modes. The TRISA register controls the data direction of the comparator 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 Section 18.0 “Electrical Characteristics”. FIGURE 13-1: COMPARATOR I/O OPERATING MODES Note: Comparator interrupts should be disabled during a Comparator mode change; otherwise, a false interrupt may occur. C1 RA0/AN0 VIN- VIN+ RA3/AN3/ Off (Read as ‘0’) Comparators Reset A A CM2:CM0 = 000 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ Off (Read as ‘0’) A A C1 RA0/AN0 VIN- VIN+ RA3/AN3/ C1OUT Two Independent Comparators A A CM2:CM0 = 100 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A C1 RA0/AN0 VIN- VIN+ RA3/AN3/ C1OUT Two Common Reference Comparators A D CM2:CM0 = 011 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A C1 RA0/AN0 VIN- VIN+ RA3/AN3/ Off (Read as ‘0’) One Independent Comparator D D CM2:CM0 = 101 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A C1 RA0/AN0 VIN- VIN+ RA3/AN3/ Off (Read as ‘0’) Comparators Off (POR Default Value) D D CM2:CM0 = 111 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ Off (Read as ‘0’) D D C1 RA0/AN0 VIN- VIN+ RA3/AN3/ C1OUT Four Inputs Multiplexed to Two Comparators A A CM2:CM0 = 010 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A From VREF Module CIS = 0 CIS = 1 CIS = 0 CIS = 1 C1 RA0/AN0 VIN- VIN+ RA3/AN3/ C1OUT Two Common Reference Comparators with Outputs A D CM2:CM0 = 110 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A A = Analog Input, port reads zeros always. D = Digital Input. CIS (CMCON<3>) is the Comparator Input Switch. RA4/T0CKI/C2OUT C1 RA0/AN0 VIN- VIN+ RA3/AN3/ C1OUT Three Inputs Multiplexed to Two Comparators A A CM2:CM0 = 001 C2 RA1/AN1 VIN- VIN+ RA2/AN2/ C2OUT A A CIS = 0 CIS = 1 C1OUT C1OUT C1OUT C1OUT C1OUT C1OUT C1OUT C1OUT CVREF CVREF CVREF CVREF CVREF CVREF CVREF CVREF |
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