PIC18F44800TESLASHML datasheet(259/484 Pages) MICROCHIP

259 / 484 page

 2004 Microchip Technology Inc.

Preliminary

DS39637A-page 257

PIC18F2480/2580/4480/4580

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 digital

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: COMPARATOR CONTROL REGISTER

R-0

R/W-0

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 RD0/PSP0/C1IN+

C2 VIN+ connects to RD2/PSP2/C2IN+

=C1 VIN- connects to RD1/PSP1/C1IN-

C2 VIN- connects to RD3/PSP3/C2IN-

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

PIC18F44800TE/ML Datasheet(PDF) 259 Page - Microchip Technology

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