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PIC16F877ATI/ML 数据表(PDF) 138 Page - Microchip Technology |
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PIC16F877ATI/ML 数据表(HTML) 138 Page - Microchip Technology |
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138 / 234 page  PIC16F87XA DS39582B-page 136 2003 Microchip Technology Inc. 12.1 Comparator Configuration There are eight modes of operation for the compara- tors. The CMCON register is used to select these modes. Figure 12-1 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 17.0 “Electrical Characteristics”. FIGURE 12-1: 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 = 010 C2 RA1/AN1 VIN- VIN+ RA2/AN2 C2OUT A A C1 RA0/AN0 VIN- VIN+ RA3/AN3 C1OUT Two Common Reference Comparators A A CM2:CM0 = 100 C2 RA1/AN1 VIN- VIN+ RA2/AN2 C2OUT A D C2 RA1/AN1 VIN- VIN+ RA2/AN2 Off (Read as ‘0’) One Independent Comparator with Output D D CM2:CM0 = 001 C1 RA0/AN0 VIN- VIN+ RA3/AN3 C1OUT 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 = 110 C2 RA1/AN1 VIN- VIN+ RA2/AN2 C2OUT A A From Comparator CIS = 0 CIS = 1 CIS = 0 CIS = 1 C1 RA0/AN0 VIN- VIN+ RA3/AN3 C1OUT Two Common Reference Comparators with Outputs A A CM2:CM0 = 101 C2 RA1/AN1 VIN- VIN+ RA2/AN2 C2OUT A D A = Analog Input, port reads zeros always. D = Digital Input. CIS (CMCON<3>) is the Comparator Input Switch. CVREF C1 RA0/AN0 VIN- VIN+ RA3/AN3 C1OUT Two Independent Comparators with Outputs A A CM2:CM0 = 011 C2 RA1/AN1 VIN- VIN+ RA2/AN2 C2OUT A A RA4/T0CKI/C1OUT RA5/AN4/SS/C2OUT RA4/T0CKI/C1OUT RA5/AN4/SS/C2OUT RA4/T0CKI/C1OUT VREF Module |
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