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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PIC18F258-E/SOSQTP 데이터시트(PDF) 252 Page - Microchip Technology |
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PIC18F258-E/SOSQTP 데이터시트(HTML) 252 Page - Microchip Technology |
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252 / 402 page  PIC18FXX8 DS41159E-page 250 © 2006 Microchip Technology Inc. 21.1 Comparator Configuration There are eight modes of operation for the compara- tors. The CMCON register is used to select these modes. Figure 21-1 shows the eight possible modes. The TRISD 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 21-1: COMPARATOR I/O OPERATING MODES Note: Comparator interrupts should be disabled during a Comparator mode change; otherwise, a false interrupt may occur. C1 RD1/PSP1 VIN- VIN+ Off (Read as ‘0’) Comparators Reset (POR Default Value) A A CM2:CM0 = 000 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 Off (Read as ‘0’) A A C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT Two Independent Comparators A A CM2:CM0 = 010 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 C2OUT A A C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT Two Common Reference Comparators A A CM2:CM0 = 100 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 C2OUT A D C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 Off (Read as ‘0’) One Independent Comparator with Output D D CM2:CM0 = 001 C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT A A C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 Off (Read as ‘0’) Comparators Off D D CM2:CM0 = 111 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 Off (Read as ‘0’) D D C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT Four Inputs Multiplexed to Two Comparators A A CM2:CM0 = 110 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 C2OUT A A From VREF Module CIS = 0 CIS = 1 CIS = 0 CIS = 1 C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT Two Common Reference Comparators with Outputs A A CM2:CM0 = 101 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 C2OUT A D A = Analog Input, port reads zeros always D = Digital Input CIS (CMCON<3>) is the Comparator Input Switch CVREF C1 RD1/PSP1 VIN- VIN+ RD0/PSP0 C1OUT Two Independent Comparators with Outputs A A CM2:CM0 = 011 C2 RD3/PSP3 VIN- VIN+ RD2/PSP2 C2OUT A A RE1/AN6/WR/C1OUT RE2/AN7/CS/C2OUT RE1/AN6/WR/ RE2/AN7/CS/C2OUT RE1/AN6/WR/C1OUT RD0/PSP0 C1OUT |
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