PIC18F44J10T-I/ML(2009) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F44J10T-I/ML
(Rev.:2009)

28/40/44-Pin High-Performance, RISC Microcontrollers

Microchip Technology 

PIC18F45J10 FAMILY

19.1 Comparator Configuration

There are eight modes of operation for the compara-

tors, shown in Figure 19-1. Bits, CM<2:0> of the

CMCON register, are used to select these modes. The

TRISA register controls the data direction of the com-

parator pins for each mode. If the Comparator mode is

changed, the comparator output level may not be valid

for the specified mode change delay shown in

Section 24.0 “Electrical Characteristics”.

Note:

Comparator interrupts should be disabled

during a Comparator mode change;

otherwise, a false interrupt may occur.

FIGURE 19-1:

COMPARATOR I/O OPERATING MODES

Comparators Reset

CM<2:0> = 000

Comparators Off (POR Default Value)

CM<2:0> = 111

RA0/AN0 A

RA3/AN3/ A

VREF+

VIN-

VIN+ C1

Off (Read as ‘0’)

RA0/AN0 D

RA3/AN3/ D

VREF+

VIN-

VIN+ C1

Off (Read as ‘0’)

RA1/AN1 A

RA2/AN2/ A

VREF-/CVREF

VIN-

VIN+ C2

Two Independent Comparators

CM<2:0> = 010

RA0/AN0 A

RA3/AN3/ A

VREF+

VIN-

VIN+ C1

RA1/AN1 A

RA2/AN2/ A

VREF-/CVREF

VIN-

VIN+ C2

Off (Read as ‘0’)

C1OUT

C2OUT

RA1/AN1 D

RA2/AN2/ D

VREF-/CVREF

VIN-

VIN+ C2

Off (Read as ‘0’)

Two Independent Comparators with Outputs

CM<2:0> = 011

RA0/AN0 A

RA3/AN3/ A

VREF+

RB5/KBI1/

T0CKI/C1OUT*

RA1/AN1 A

RA2/AN2/ A

VREF-/CVREF

VIN-

VIN+ C1

VIN-

VIN+ C2

C1OUT

C2OUT

RA5/AN4/SS1/C2OUT*

Two Common Reference Comparators

CM<2:0> = 100

RA0/AN0 A

RA3/AN3/ A

VREF+

VIN-

VIN+ C1

C1OUT

RA1/AN1 A

RA2/AN2/ D

VREF-/CVREF

VIN-

VIN+ C2

C2OUT

Two Common Reference Comparators with Outputs

CM<2:0> = 101

RA0/AN0 A

RA3/AN3/ A

VREF+

RB5/KBI1/

T0CKI/C1OUT*

VIN-

VIN+ C1

C1OUT

RA1/AN1 A

RA2/AN2/ D

VREF-/CVREF

VIN-

VIN+ C2

C2OUT

RA5/AN4/SS1/C2OUT*

One Independent Comparator with Output

CM<2:0> = 001

RA0/AN0 A

VIN-

RA3/AN3/ A

VREF+

VIN+ C1

RB5/KBI1/T0CKI/C1OUT*

C1OUT

RA1/AN1 D

RA2/AN2/ D

VREF-/CVREF/

VIN-

VIN+ C2

Off (Read as ‘0’)

Four Inputs Multiplexed to Two Comparators

CM<2:0> = 110

RA0/AN0 A

RA3/AN3/ A

VREF+

CIS = 0

CIS = 1

VIN-

VIN+ C1

RA1/AN1 A

RA2/AN2/ A

VREF-/CVREF/

CIS = 0

CIS = 1

VIN-

VIN+ C2

C1OUT

C2OUT

CVREF From VREF Module

A = Analog Input, port reads zeros always

D = Digital Input

CIS (CMCON<3>) is the Comparator Input Switch

* Setting the TRISA<5> bit will disable the comparator outputs by configuring the pins as inputs.

DS39682E-page 226

© 2009 Microchip Technology Inc.

Share Link: