PIC16C62XAT-20I/SO View Datasheet(PDF) - Microchip Technology
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PIC16C62XAT-20I/SO Datasheet PDF : 108 Pages
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PIC16C62X
7.1 Comparator Configuration
There are eight modes of operation for the
comparators. The CMCON register is used to select the
mode. Figure 7-2 shows the eight possible modes. The
TRISA register controls the data direction of the com-
parator 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 7-2: COMPARATOR I/O OPERATING MODES
A
RA0/AN0
A
RA3/AN3
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C1
VIN- -
VIN+ + C2
Comparators Reset
Off
(Read as '0')
Off
(Read as '0')
CM<2:0> = 000
A
RA0/AN0
A
RA3/AN3
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C1
VIN- -
VIN+ + C2
Two Independent Comparators
C1OUT
C2OUT
CM<2:0> = 100
A
RA0/AN0
D
RA3/AN3
VIN- -
VIN+ + C1
C1OUT
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C2
C2OUT
CM<2:0> = 011
Two Common Reference Comparators
D
RA0/AN0
D
RA3/AN3
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C1
VIN- -
VIN+ + C2
One Independent Comparator
Off
(Read as '0')
C2OUT
CM<2:0> = 101
A = Analog Input, Port Reads Zeros Always
D = Digital Input
CIS = CMCON<3>, Comparator Input Switch
D
RA0/AN0
D
RA3/AN3
D
RA1/AN1
D
RA2/AN2
VIN- -
VIN+ + C1
VIN- -
VIN+ + C2
Comparators Off
Off
(Read as '0')
Off
(Read as '0')
CM<2:0> = 111
RA0/AN0 A
RA3/AN3 A
RA1/AN1 A
RA2/AN2 A
CIS=0 VIN- -
CIS=1VIN+ + C1
CIS=0 VIN- -
CIS=1 VIN+ + C2
C1OUT
C2OUT
Four Inputs Multiplexed to
Two Comparators
From VREF Module
CM<2:0> = 010
A
RA0/AN0
D
RA3/AN3
VIN- -
VIN+ + C1
C1OUT
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C2
RA4 Open Drain
C2OUT
CM<2:0> = 110
Two Common Reference Comparators with Outputs
A
RA0/AN0
A
RA3/AN3
CIS=0
VIN- -
CIS=1
VIN+ +
C1
C1OUT
A
RA1/AN1
A
RA2/AN2
VIN- -
VIN+ + C2
Three Inputs Multiplexed to
Two Comparators
C2OUT
CM<2:0> = 001
DS30235G-page 38
Preliminary
© 1998 Microchip Technology Inc.
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