PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 237
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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19.0
The comparator module contains two analog compara-
tors. The inputs to the comparators are multiplexed
with the RF1 through RF6 pins. The on-chip Voltage
Reference (Section 20.0) can also be an input to the
comparators.
REGISTER 19-1: CMCON REGISTER
2000 Microchip Technology Inc.
COMPARATOR MODULE
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
bit 7
C2OUT: Comparator 2 Output
When C2INV = 0:
1 = C2 V
0 = C2 V
When C2INV = 1:
1 = C2 V
0 = C2 V
C1OUT: Comparator 1 Output
When C1INV = 0:
1 = C1 V
0 = C1 V
When C1INV = 1:
1 = C1 V
0 = C1 V
C2INV: Comparator 2 Output Inversion
1 = C2 output inverted
0 = C2 output not inverted
C1INV: Comparator 1 Output Inversion
1 = C1 Output inverted
0 = C1 Output not inverted
CIS: Comparator Input Switch
When CM2:CM0 = 110:
1 = C1 V
0 = C1 V
CM2:CM0: Comparator Mode
Figure 19-1 shows the Comparator modes and CM2:CM0 bit settings
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
– connects to RF3/AN8
– connects to RF4/AN9
+ > C2 V
+ < C2 V
+ < C2 V
+ > C2 V
+ > C1 V
+ < C1 V
+ < C1 V
+ > C1 V
– connects to RF5/AN10
– connects to RF6/AN11
C1OUT
R-0
IN
IN
IN
IN
IN
IN
IN
IN
Advanced Information
–
–
–
–
–
–
–
–
C2INV
R/W-0
’1’ = Bit is set
W = Writable bit
C1INV
R/W-0
The CMCON register, shown as Register 19-1, con-
trols the comparator input and output multiplexers. A
block diagram of the comparator is shown in
Figure 19-1.
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
R/W-0
CIS
R/W-0
CM2
PIC18CXX8
x = Bit is unknown
R/W-0
CM1
DS30475A-page 237
R/W-0
CM0
bit 0
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