PIC18F4580-ESLASHML datasheet(263/490 Pages) MICROCHIP

263 / 490 page

DS39637D-page 263

PIC18F2480/2580/4480/4580

21.0 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 22.0

“Comparator Voltage Reference Module”). The

digital outputs (normal or inverted) are available at the

pin level and can also be read through the control

The CMCON register (Register 21-1) selects the

comparator input and output configuration. Block

diagrams of the various comparator configurations are

shown in Figure 21-1.

CMCON: COMPARATOR CONTROL REGISTER

R-0

R/W-0

C2OUT

C1OUT

C2INV

C1INV

CIS

CM2

CM1

CM0

bit 7

bit 0

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

bit 7

C2OUT: Comparator 2 Output bit

When C2INV = 0:

1 = C2 VIN+ > C2 VIN-

0 = C2 VIN+ < C2 VIN-

When C2INV = 1:

1 = C2 VIN+ < C2 VIN-

0 = C2 VIN+ > C2 VIN-

bit 6

C1OUT: Comparator 1 Output bit

When C1INV = 0:

1 = C1 VIN+ > C1 VIN-

0 = C1 VIN+ < C1 VIN-

When C1INV = 1:

1 = C1 VIN+ < C1 VIN-

0 = C1 VIN+ > C1 VIN-

bit 5

C2INV: Comparator 2 Output Inversion bit

1 = C2 output inverted

0 = C2 output not inverted

bit 4

C1INV: Comparator 1 Output Inversion bit

1 = C1 output inverted

0 = C1 output not inverted

bit 3

CIS: Comparator Input Switch bit

When CM<2:0> = 110:

1 =C1 VIN- connects to RD0/PSP0/C1IN+

C2 VIN- connects to RD2/PSP2/C2IN+

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

C2 VIN- connects to RD3/PSP3/C2IN-

bit 2-0

CM<2:0>: Comparator Mode bits

Figure 21-1 shows the Comparator modes and the CM<2:0> bit settings.

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