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Sheet目录3841

130页 131页 132页 133页 [134页]135页 136页 137页 138页

PIC18F2X1X/4X1X

DS39636D-page 224

2009 Microchip Technology Inc.

19.1

Comparator Configuration

There are eight modes of operation for the compara-

tors, shown in Figure 19-1. Bits CM2:CM0 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 25.0 “Electrical Characteristics”.

FIGURE 19-1:

COMPARATOR I/O OPERATING MODES

Note:

Comparator interrupts should be disabled

during a Comparator mode change;

otherwise, a false interrupt may occur.

RA0/AN0

VIN-

VIN+

RA3/AN3/

Off (Read as ‘0’)

Comparators Reset

CM2:CM0 = 000

RA1/AN1

VIN-

VIN+

RA2/AN2/

Off (Read as ‘0’)

VIN-

VIN+

C1OUT

Two Independent Comparators

CM2:CM0 = 010

VIN-

VIN+

C2OUT

VIN-

VIN+

C1OUT

Two Common Reference Comparators

CM2:CM0 = 100

VIN-

VIN+

C2OUT

VIN-

VIN+

Off (Read as ‘0’)

One Independent Comparator with Output

CM2:CM0 = 001

VIN-

VIN+

C1OUT

VIN-

VIN+

Off (Read as ‘0’)

Comparators Off (POR Default Value)

CM2:CM0 = 111

VIN-

VIN+

Off (Read as ‘0’)

VIN-

VIN+

C1OUT

Four Inputs Multiplexed to Two Comparators

CM2:CM0 = 110

VIN-

VIN+

C2OUT

From VREF Module

CIS = 0

CIS = 1

CIS = 0

CIS = 1

VIN-

VIN+

C1OUT

Two Common Reference Comparators with Outputs

CM2:CM0 = 101

VIN-

VIN+

C2OUT

A = Analog Input, port reads zeros always

D = Digital Input

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

CVREF

VIN-

VIN+

C1OUT

Two Independent Comparators with Outputs

CM2:CM0 = 011

VIN-

VIN+

C2OUT

RA5/AN4/SS/HLVDIN/C2OUT*

RA4/T0CKI/C1OUT*

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

RA1/AN1

RA2/AN2/

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

RA1/AN1

RA2/AN2/

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

RA1/AN1

RA2/AN2/

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

RA1/AN1

RA2/AN2/

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

RA1/AN1

RA2/AN2/

VREF+

VREF-/CVREF

RA0/AN0

RA3/AN3/

VREF+

RA1/AN1

RA2/AN2/

VREF-/CVREF

RA4/T0CKI/C1OUT*

RA5/AN4/SS/HLVDIN/C2OUT*

RA0/AN0

RA3/AN3/

VREF+

RA1/AN1

RA2/AN2/

VREF-/CVREF

RA4/T0CKI/C1OUT*

* Setting the TRISA<5:4> bits will disable the comparator outputs by configuring the pins as inputs.

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