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18F8680 bảng dữ liệu(PDF) 262 Page - Microchip Technology |
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18F8680 bảng dữ liệu(HTML) 262 Page - Microchip Technology |
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262 / 496 page  PIC18F6585/8585/6680/8680 DS30491C-page 260 2004 Microchip Technology Inc. 20.1 Comparator Configuration There are eight modes of operation for the compara- tors. The CMCON register is used to select these modes. Figure 20-1 shows the eight possible modes. The TRISF 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 27.0 “Electrical Characteristics”. FIGURE 20-1: COMPARATOR I/O OPERATING MODES Note: Comparator interrupts should be disabled during a Comparator mode change. Otherwise, a false interrupt may occur. C1 RF6/AN11 VIN- VIN+ RF5/AN10 Off (Read as ‘0’) Comparators Reset (POR Default Value) A A CM2:CM0 = 000 C2 RF4/AN9 VIN- VIN+ RF3/AN8 Off (Read as ‘0’) A A C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT Two Independent Comparators A A CM2:CM0 = 010 C2 RF4/AN9 VIN- VIN+ RF3/AN8 C2OUT A A C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT Two Common Reference Comparators A A CM2:CM0 = 100 C2 RF4/AN9 VIN- VIN+ RF3/AN8 C2OUT A D C2 RF4/AN9 VIN- VIN+ RF3/AN8 Off (Read as ‘0’) One Independent Comparator with Output D D CM2:CM0 = 001 C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT A A C1 RF6/AN11 VIN- VIN+ RF5/AN10 Off (Read as ‘0’) Comparators Off D D CM2:CM0 = 111 C2 RF4/AN9 VIN- VIN+ RF3/AN8 Off (Read as ‘0’) D D C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT Four Inputs Multiplexed to Two Comparators A A CM2:CM0 = 110 C2 RF4/AN9 VIN- VIN+ RF3/AN8 C2OUT A A From VREF Module CIS = 0 CIS = 1 CIS = 0 CIS = 1 C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT Two Common Reference Comparators with Outputs A A CM2:CM0 = 101 C2 RF4/AN9 VIN- VIN+ RF3/AN8 C2OUT A D A = Analog Input, port reads zeros always D = Digital Input CIS (CMCON<3>) = Comparator Input Switch CVREF C1 RF6/AN11 VIN- VIN+ RF5/AN10 C1OUT Two Independent Comparators with Outputs A A CM2:CM0 = 011 C2 RF4/AN9 VIN- VIN+ RF3/AN8 C2OUT A A RF2/AN7/C1OUT RF1/AN6/C2OUT RF2/AN7/C1OUT RF1/AN6/C2OUT RF2/AN7/C1OUT |
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