PIC18F4680ISPQTP datasheet(259/482 Pages) MICROCHIP

259 / 482 page

Preliminary

DS39625C-page 257

PIC18F2585/2680/4585/4680

20.0

COMPARATOR MODULE

The analog comparator module contains two compara-

tors 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 volt-

age 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

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