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16F628 Datasheet(PDF) 64 Page - Microchip Technology

Part # 16F628
Description  FLASH-Based 8-Bit CMOS Microcontrollers
PDF  168 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

16F628 Datasheet(HTML) 64 Page - Microchip Technology

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PIC16F627A/628A/648A
DS40044A-page 62
Preliminary
 2002 Microchip Technology Inc.
10.1
Comparator Configuration
There
are
eight
modes
of
operation
for
the
comparators. The CMCON register is used to select
the mode. Figure 10-1 shows the eight possible
modes. The TRISA register controls the data direction
of the comparator pins for each mode. If the Compara-
tor mode is changed, the comparator output level may
not be valid for the specified mode change delay
shown in Table 17-2.
FIGURE 10-1:
COMPARATOR I/O OPERATING MODES
Note 1: Comparator interrupts should be disabled
during a Comparator mode change, other-
wise a false interrupt may occur.
2: Comparators can have an inverted out-
put. See Figure 10-3.
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Comparators Reset (POR Default Value)
A
A
CM2:CM0 = 000
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Two Independent Comparators
A
A
CM2:CM0 = 100
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Two Common Reference Comparators
A
D
CM2:CM0 = 011
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Off (Read as '0')
One Independent Comparator
D
D
CM2:CM0 = 101
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
C1
V
IN-
V
IN+
Off (Read as '0')
Comparators Off
D
D
CM2:CM0 = 111
C2
V
IN-
V
IN+
Off (Read as '0')
D
D
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Four Inputs Multiplexed to Two Comparators
A
A
CM2:CM0 = 010
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
From V
REF
CIS = 0
CIS = 1
CIS = 0
CIS = 1
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Two Common Reference Comparators with Outputs
A
D
CM2:CM0 = 110
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
Open Drain
A = Analog Input, port reads zeros always.
D = Digital Input.
CIS (CMCON<3>) is the Comparator Input Switch.
RA4/T0CKI/CMP2
C1
RA0/AN0
V
IN-
V
IN+
RA3/AN3/CMP1
Three Inputs Multiplexed to Two Comparators
A
A
CM2:CM0 = 001
C2
RA1/AN1
V
IN-
V
IN+
RA2/AN2/V
REF
A
A
CIS = 0
CIS = 1
V
SS
V
SS
RA0/AN0
RA3/AN3/CMP1
RA1/AN1
RA2/AN2/V
REF
Module
C1V
OUT
C2V
OUT
C1V
OUT
C2V
OUT
Off (Read as '0')
Off (Read as '0')
C2V
OUT
C1V
OUT
C2V
OUT
C1V
OUT
C2V
OUT
C1V
OUT
C2V
OUT



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