PIC18F2510-E/P MICROCHIP [Microchip Technology], PIC18F2510-E/P Datasheet - Page 221

• Manufacturer Part Number: PIC18F2510-E/P
• Description: 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

19.0
The analog comparator module contains two compara-
tors that can be configured in a variety of ways. The
inputs can be selected from the analog inputs multiplexed
with pins RA0 through RA5, as well as the on-chip volt-
age reference (see Section 20.0 “Comparator Voltage
Reference Module”). The digital outputs (normal or
inverted) are available at the pin level and can also be
read through the control register.
REGISTER 19-1:
© 2009 Microchip Technology Inc.
COMPARATOR MODULE
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
CMCON: COMPARATOR CONTROL REGISTER
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 19-1 shows the Comparator modes and the CM2:CM0 bit settings.
bit 7
Legend:
R = Readable bit
-n = Value at POR
C2OUT
R-0
C2 V
C2 V
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 RA3/AN3/V
+ connects to RA2/AN2/V
- connects to RA0/AN0
- connects to RA1/AN1
C1OUT
R-0
IN
IN
IN
IN
IN
IN
IN
IN
-
-
-
-
-
-
-
-
C2INV
R/W-0
W = Writable bit
‘1’ = Bit is set
REF
REF
C1INV
R/W-0
The CMCON register (Register 19-1) selects the
comparator input and output configuration. Block
diagrams of the various comparator configurations are
shown in Figure 19-1.
+
-/CV
REF
PIC18F2X1X/4X1X
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CIS
R/W-1
CM2
x = Bit is unknown
R/W-1
CM1
DS39636D-page 223
R/W-1
CM0
bit 0