PIC16C62X
The CMCON register, shown in Figure 7-1, controls the
comparator input and output multiplexers. A block
diagram of the comparator is shown in Figure 7-2.
7.0
COMPARATOR MODULE
The comparator module contains two analog
comparators. The inputs to the comparators are
multiplexed with the RA0 through RA3 pins. The
on-chip Voltage Reference (Section 8.0) can also be an
input to the comparators.
FIGURE 7-1:
CMCON REGISTER (ADDRESS 1Fh)
R-0
R-0
U-0
U-0
R/W-0
CIS
R/W-0
CM2
R/W-0
CM1
R/W-0
CM0
C2OUT C1OUT
bit7
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
bit0
- n =Value at POR reset
bit 7:
bit 6:
C2OUT: Comparator 2 output
1 = C2 VIN+ > C2 VIN–
0 = C2 VIN+ < C2 VIN–
C1OUT: Comparator 1 output
1 = C1 VIN+ > C1 VIN–
0 = C1 VIN+ < C1 VIN–
bit 5-4: Unimplemented: Read as '0'
bit 3:
CIS: Comparator Input Switch
When CM<2:0>: = 001:
1 = C1 VIN– connects to RA3
0 = C1 VIN– connects to RA0
When CM<2:0> = 010:
1 = C1 VIN– connects to RA3
C2 VIN– connects to RA2
0 = C1 VIN– connects to RA0
C2 VIN– connects to RA1
bit 2-0: CM<2:0>: Comparator mode
Figure 7-2.
1998 Microchip Technology Inc.
Preliminary
DS30235G-page 37
MICROCHIP [ MICROCHIP ]
