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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F628-20/SS датащи(PDF) 58 Page - Microchip Technology |
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PIC16F628-20/SS датащи(HTML) 58 Page - Microchip Technology |
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58 / 160 page  PIC16F62X DS40300B-page 58 Preliminary © 1999 Microchip Technology Inc. 9.1 Comparator Configuration There are eight modes of operation for the comparators. The CMCON register is used to select the mode. Figure 9-1 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 Table 12-2. Note: Comparator interrupts should be disabled during a comparator mode change other- wise a false interrupt may occur. FIGURE 9-1: COMPARATOR I/O OPERATING MODES C1 RA0/AN0 Vin- Vin+ RA3/AN3/C10 Off (Read as ’0’) Comparators Reset (POR Default Value) 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/C10 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/C10 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/C10 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/C10 Off (Read as ’0’) Comparators Off 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/C10 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/C10 C1OUT Two Common Reference Comparators with Outputs A D CM2:CM0 = 110 C2 RA1/AN1 Vin- Vin+ RA2/AN2 C2OUT A A Open Drain A = Analog Input, port reads zeros always. D = Digital Input. CIS (CMCON<3>) is the Comparator Input Switch. RA4/T0CKI/C20 C1 RA0/AN0 Vin- Vin+ RA3/AN3/C10 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 |
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