PIC16F747 Microchip Technology Inc., PIC16F747 Datasheet - Page 163

• Manufacturer Part Number: PIC16F747
• Description: 28/40/44-pin, 8-bit Cmos Flash Microcontrollers With 10-bit A/d And Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

13.0
The comparator module contains two analog com-
parators.
multiplexed with I/O port pins, RA0 through RA3, while
the outputs are multiplexed to pins RA4 and RA5. The
on-chip voltage reference (Section 14.0 “Comparator
Voltage Reference Module”) can also be an input to
the comparators.
REGISTER 13-1:
 2004 Microchip Technology Inc.
COMPARATOR MODULE
The
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
inputs
CMCON: COMPARATOR MODULE CONTROL REGISTER (ADDRESS 9Ch)
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 13-1 shows the Comparator modes and CM2:CM0 bit settings.
Legend:
R = Readable bit
-n = Value at POR
bit 7
C2OUT
to
R-0
C2 V
C2 V
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 RA3/AN3
- connects to RA2/AN2
- connects to RA0/AN0
- connects to RA1/AN1
comparators
C1OUT
R-0
IN
IN
IN
IN
IN
IN
IN
IN
-
-
-
-
-
-
-
-
C2INV
R/W-0
are
W = Writable bit
‘1’ = Bit is set
C1INV
R/W-0
The CMCON register (Register 13-1) controls the
comparator input and output multiplexers. A block
diagram of the various comparator configurations is
shown in Figure 13-1.
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
CIS
R/W-1
CM2
PIC16F7X7
x = Bit is unknown
R/W-1
CM1
DS30498C-page 161
R/W-1
CM0
bit 0