PIC18F24 MICROCHIP [Microchip Technology], PIC18F24 Datasheet - Page 251

• Manufacturer Part Number: PIC18F24
• Description: 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

21.0
The comparator module contains two analog com-
parators.
multiplexed with the RD0 through RD3 pins. The on-chip
voltage reference (Section 22.0 “Comparator Voltage
Reference Module”) can also be an input to the
comparators.
REGISTER 21-1:
 2004 Microchip Technology Inc.
Note:
COMPARATOR MODULE
The
The
available
PIC18F458.
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
inputs
analog
CMCON: COMPARATOR CONTROL REGISTER
bit 7
C2OUT: Comparator 2 Output bit
When C2INV = 0:
1 = C2 V
0 = C2 V
When C2INV = 1:
1 = C2 V
0 = C2 V
C1OUT: Comparator 1 Output bit
When C1INV = 0:
1 = C1 V
0 = C1 V
When C1INV = 1:
1 = C1 V
0 = C1 V
C2INV: Comparator 2 Output Inversion bit
1 = C2 output inverted
0 = C2 output not inverted
C1INV: Comparator 1 Output Inversion bit
1 = C1 output inverted
0 = C1 output not inverted
CIS: Comparator Input Switch bit
When CM2:CM0 = 110:
1 = C1 V
0 = C1 V
CM2:CM0: Comparator Mode bits
Figure 21-1 shows the Comparator modes and CM2:CM0 bit settings.
Legend:
R = Readable bit
-n = Value at POR
on
C2OUT
to
R-0
C2 V
C2 V
comparators
the
the
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
+ > C2 V
+ < C2 V
+ < C2 V
+ > C2 V
+ > C1 V
+ < C1 V
+ < C1 V
+ > C1 V
- connects to RD0/PSP0
- connects to RD2/PSP2
- connects to RD1/PSP1
- connects to RD3/PSP3
PIC18F448
comparators
C1OUT
R-0
IN
IN
IN
IN
IN
IN
IN
IN
are
-
-
-
-
-
-
-
-
C2INV
R/W-0
only
and
are
W = Writable bit
‘1’ = Bit is set
C1INV
R/W-0
The CMCON register, shown in Register 21-1, controls
the comparator input and output multiplexers. A block
diagram of the comparator is shown in Figure 21-1.
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CIS
R/W-0
CM2
PIC18FXX8
x = Bit is unknown
R/W-0
CM1
DS41159D-page 249
R/W-0
CM0
bit 0