PIC18F4520ESLASHMLSTQP datasheet(235/390 Pages) MICROCHIP

235 / 390 page

 2004 Microchip Technology Inc.

Preliminary

DS39631A-page 233

PIC18F2420/2520/4420/4520

20.0

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 21.0

“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 20-1) selects the

comparator input and output configuration. Block

diagrams of the various comparator configurations are

shown in Figure 20-1.

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/VREF+

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

=C1 VIN- connects to RA0/AN0

C2 VIN- connects to RA1/AN1

bit 2-0

CM2:CM0: Comparator Mode bits

Figure 20-1 shows the Comparator modes and the 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

PIC18F4520E/MLSTQP Datasheet(PDF) 235 Page - Microchip Technology

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