PIC18F44J10-ISLASHSOSQTP datasheet(227/368 Pages) MICROCHIP

227 / 368 page

DS39682E-page 225

PIC18F45J10 FAMILY

19.0

COMPARATOR MODULE

The

analog

comparator

module

contains

two

comparators that can be configured in a variety of

ways. The inputs can be selected from the analog

inputs multiplexed with pins RA0 through RA5, as well

as the on-chip voltage reference (see Section 20.0

“Comparator Voltage Reference Module”

). The digi-

tal outputs (normal or inverted) are available at the pin

level and can also be read through the control register.

The CMCON register (Register 19.1) selects the

comparator input and output configuration. Block

diagrams of the various comparator configurations are

shown in Figure 19-1.

CMCON: COMPARATOR CONTROL REGISTER

R-0

R/W-0

R/W-1

C2OUT

C1OUT

C2INV

C1INV

CIS

CM2

CM1

CM0

bit 7

bit 0

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

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 CM<2:0> = 110:

=C1 VIN- connects to RA3/AN3/VREF+

C2 VIN- connects to RA2/AN2/VREF-/CVREF

=C1 VIN- connects to RA0/AN0

C2 VIN- connects to RA1/AN1

bit 2-0

CM<2:0>:

Comparator Mode bits

Figure 19-1 shows the Comparator modes and the CM<2:0> bit settings.

PIC18F44J10-I/SOSQTP Datasheet(PDF) 227 Page - Microchip Technology

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