PIC16C642-04SLASHP datasheet(47/136 Pages) MICROCHIP

47 / 136 page

Preliminary

DS30559A-page 47

PIC16C64X & PIC16C66X

7.0

COMPARATOR MODULE

The

comparator

module

contains

two

analog

comparators. The inputs to the comparators are

multiplexed with pins RA0 through RA4. The on-chip

Voltage Reference (Section 8.0) can also be an input to

the comparators.

The CMCON register, shown in Figure 7-1, controls the

comparator input and output multiplexers. A block

diagram of the comparator is shown in Figure 7-2.

FIGURE 7-1:

CMCON REGISTER (ADDRESS 1Fh)

R-0

U-0

R/W-0

C2OUT

C1OUT

—

CIS

CM2

CM1

CM0

R =Readable bit

W =Writable bit

U =Unimplemented bit, read

as ‘0’

- n =Value at POR reset

bit7

bit0

bit 7:

C2OUT: Comparator 2 output

1 = C2 VIN+ > C2 VIN–

0 = C2 VIN+ < C2 VIN–

bit 6:

C1OUT: Comparator 1 output

1 = C1 VIN+ > C1 VIN–

0 = C1 VIN+ < C1 VIN–

bit 5-4:

Unimplemented: Read as '0'

bit 3:

CIS: Comparator Input Switch

When CM2:CM0: = 001:

Then:

1 = C1 VIN– connects to RA3

0 = C1 VIN– connects to RA0

When CM2:CM0 = 010:

Then:

1 = C1 VIN– connects to RA3

C2 VIN– connects to RA2

0 = C1 VIN– connects to RA0

C2 VIN– connects to RA1

bit 2-0:

CM2:CM0: Comparator mode

Figure 7-2 shows the comparator modes and CM2:CM0 bit settings.

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