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2003 Microchip Technology Inc.

DS39582B-page 135

PIC16F87XA

12.0

COMPARATOR MODULE

The comparator module contains two analog compara-

tors. The inputs to the comparators are multiplexed

with I/O port pins RA0 through RA3, while the outputs

are multiplexed to pins RA4 and RA5. The on-chip volt-

age reference (Section 13.0 “Comparator Voltage

Reference Module”) can also be an input to the

comparators.

The CMCON register (Register 12-1) controls the com-

parator input and output multiplexers. A block diagram

of the various comparator configurations is shown in

Figure 12-1.

REGISTER 12-1:

CMCON REGISTER

R-0

R/W-0

R/W-1

C2OUT

C1OUT

C2INV

C1INV

CIS

CM2

CM1

CM0

bit 7

bit 0

bit 7

C2OUT: Comparator 2 Output bit

When C2INV = 0:

= C2 VIN+ > C2 VIN-

= C2 VIN+ < C2 VIN-

When C2INV = 1:

= C2 VIN+ < C2 VIN-

= C2 VIN+ > C2 VIN-

bit 6

C1OUT: Comparator 1 Output bit

When C1INV = 0:

= C1 VIN+ > C1 VIN-

= C1 VIN+ < C1 VIN-

When C1INV = 1:

= C1 VIN+ < C1 VIN-

= C1 VIN+ > C1 VIN-

bit 5

C2INV: Comparator 2 Output Inversion bit

= C2 output inverted

= C2 output not inverted

bit 4

C1INV: Comparator 1 Output Inversion bit

= C1 output inverted

= C1 output not inverted

bit 3

CIS: Comparator Input Switch bit

When CM2:CM0 = 110:

=C1 VIN- connects to RA3/AN3

C2 VIN- connects to RA2/AN2

=C1 VIN- connects to RA0/AN0

C2 VIN- connects to RA1/AN1

bit 2

CM2:CM0: Comparator Mode bits

Figure 12-1 shows the Comparator modes and CM2:CM0 bit settings.

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

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