PIC18F2480 MICROCHIP [Microchip Technology], PIC18F2480 Datasheet - Page 259

• Manufacturer Part Number: PIC18F2480
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

20.0
The
comparators 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
“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 20-1:
 2004 Microchip Technology Inc.
analog
COMPARATOR MODULE
voltage
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
comparator
reference
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 20-1 shows the Comparator modes and the CM2:CM0 bit settings.
Legend:
R = Readable bit
-n = Value at POR
bit 7
C2OUT
R-0
C2 V
C2 V
module
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
(see
+ > C2 V
+ < C2 V
+ < C2 V
+ > C2 V
+ > C1 V
+ < C1 V
+ < C1 V
+ > C1 V
+ connects to RD0/PSP0/C1IN+
+ connects to RD2/PSP2/C2IN+
- connects to RD1/PSP1/C1IN-
- connects to RD3/PSP3/C2IN-
C1OUT
R-0
contains
Section 21.0
IN
IN
IN
IN
IN
IN
IN
IN
-
-
-
-
-
-
-
-
PIC18F2480/2580/4480/4580
C2INV
R/W-0
Preliminary
two
W = Writable bit
‘1’ = Bit is set
C1INV
R/W-0
The CMCON register (Register 20-1) selects the
comparator input and output configuration. Block
diagrams of the various comparator configurations are
shown in Figure 20-1.
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CIS
R/W-0
CM2
x = Bit is unknown
R/W-0
CM1
DS39637A-page 257
R/W-0
CM0
bit 0