Datasheet

 2003 Microchip Technology Inc. DS30235J-page 37
PIC16C62X
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.
The CMCON register, shown in Register 7-1, controls
the comparator input and output multiplexers. A block
diagram of the comparator is shown in Figure 7-1.
REGISTER 7-1: CMCON REGISTER (ADDRESS 1Fh)
R-0 R-0 U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0
C2OUT C1OUT
— — CIS CM2 CM1 CM0
bit 7 bit 0
bit 7 C2OUT: Comparator 2 output
1 = C2 V
IN+ > C2 VIN-
0 = C2 V
IN+ < C2 VIN-
bit 6 C1OUT: Comparator 1 output
1 = C1 V
IN+ > C1 VIN-
0 = C1 V
IN+ < C1 VIN-
bit 5-4 Unimplemented: Read as ‘0’
bit 3 CIS: Comparator Input Switch
When CM<2:0>: = 001:
1 = C1 V
IN- connects to RA3
0 = C1 V
IN- connects to RA0
When CM<2:0> = 010:
1 = C1 V
IN- connects to RA3
C2 V
IN- connects to RA2
0 = C1 V
IN- connects to RA0
C2 V
IN- connects to RA1
bit 2-0 CM<2:0>: Comparator mode.
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
- n = Value at POR ’1’ = Bit is set ’0’ = Bit is cleared x = Bit is unknown