PIC16F676-I Datasheet, PDF (39/132 Pages) Microchip Technology – 14-Pin, Flash-Based 8-Bit CMOS Microcontrollers

PIC16F630/676
6.0 COMPARATOR MODULE
The PIC16F630/676 devices have one analog compar-
ator. The inputs to the comparator are multiplexed with
the RA0 and RA1 pins. There is an on-chip Comparator
Voltage Reference that can also be applied to an input
of the comparator. In addition, RA2 can be configured
as the comparator output. The Comparator Control
Register (CMCON), shown in Register 6-1, contains
the bits to control the comparator.
REGISTER 6-1:
CMCON — COMPARATOR CONTROL REGISTER (ADDRESS: 19h)
U-0
R-0
U-0
R/W-0 R/W-0 R/W-0 R/W-0
—
COUT
—
CINV
CIS
CM2
CM1
bit 7
R/W-0
CM0
bit 0
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
Unimplemented: Read as ‘0’
COUT: Comparator Output bit
When CINV = 0:
1 = VIN+ > VIN-
0 = VIN+ < VIN-
When CINV = 1:
1 = VIN+ < VIN-
0 = VIN+ > VIN-
Unimplemented: Read as ‘0’
CINV: Comparator Output Inversion bit
1 = Output inverted
0 = Output not inverted
CIS: Comparator Input Switch bit
When CM2:CM0 = 110 or 101:
1 = VIN- connects to CIN+
0 = VIN- connects to CIN-
CM2:CM0: Comparator Mode bits
Figure 6-2 shows the Comparator modes and CM2:CM0 bit settings
Legend:
R = Readable bit
- n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
 2010 Microchip Technology Inc.
DS40039F-page 39