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PIC16F684-E/ST Datasheet(PDF) 59 Page - Microchip Technology

Part # PIC16F684-E/ST
Description  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  164 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F684-E/ST Datasheet(HTML) 59 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS41202C-page 57
PIC16F684
8.3
Comparator Configuration
There are eight modes of operation for the compara-
tors. The CMCON0 register is used to select these
modes. Figure 8-3 shows the eight possible modes.
If the Comparator mode is changed, the comparator
output level may not be valid for the specified mode
change delay shown in Section 15.0 “Electrical
Specifications”.
FIGURE 8-3:
COMPARATOR I/O OPERATING MODES
Note:
Comparator interrupts should be disabled
during
a
Comparator
mode
change.
Otherwise, a false interrupt may occur.
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
Off (Read as ‘0’)
Comparators Reset (POR Default Value)
A
A
CM<2:0> = 000
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
Off (Read as ‘0’)
A
A
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
C1OUT
Two Independent Comparators
A
A
CM<2:0> = 100
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
C1OUT
Two Common Reference Comparators
A
D
CM<2:0> = 011
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
Off (Read as ‘0’)
One Independent Comparator
D
D
CM<2:0> = 101
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
Off (Read as ‘0’)
Comparators Off (Lowest Power)
D
D
CM<2:0> = 111
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
Off (Read as ‘0’)
D
D
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
C1OUT
Four Inputs Multiplexed to Two Comparators
A
A
CM<2:0> = 010
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
From
CVREF Module
CIS = 0
CIS = 1
CIS = 0
CIS = 1
C1
RA1/AN1
VIN-
VIN+
RA2/C1OUT
C1OUT
Two Common Reference Comparators with Outputs
A
D
CM<2:0> = 110
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
D = Digital Input
RC4/C2OUT
C1
RA1/AN1
VIN-
VIN+
RA0/AN0
C1OUT
Three Inputs Multiplexed to Two Comparators
A
A
CM<2:0> = 001
C2
RC1/AN5
VIN-
VIN+
RC0/AN4
C2OUT
A
A
CIS = 0
CIS = 1
Legend: A = Analog Input, ports always read ‘0’
CIS (CMCON0<3>) is the Comparator Input Switch



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