PIC16C621 datasheet(39/128 Pages) MICROCHIP

39 / 128 page

 2003 Microchip Technology Inc.

DS30235J-page 37

PIC16C62X

7.0

COMPARATOR MODULE

The

comparator

module

contains

two

analog

comparators. The inputs to the comparators are

multiplexed with the RA0 through RA3 pins. The On-

Chip Voltage Reference (Section 8.0) can also be an

input to the comparators.

The CMCON register, shown in Register 7-1, controls

the comparator input and output multiplexers. A block

diagram of the comparator is shown in Figure 7-1.

CMCON REGISTER (ADDRESS 1Fh)

R-0

U-0

R/W-0

C2OUT

C1OUT

—

CIS

CM2

CM1

CM0

bit 7

bit 0

bit 7

C2OUT: Comparator 2 output

= C2 V

IN+ > C2 VIN-

= C2 V

IN+ < C2 VIN-

bit 6

C1OUT: Comparator 1 output

= C1 V

IN+ > C1 VIN-

= C1 V

IN+ < C1 VIN-

bit 5-4

Unimplemented: Read as ‘0’

bit 3

CIS: Comparator Input Switch

When CM<2:0>: = 001:

= C1 V

IN- connects to RA3

= C1 V

IN- connects to RA0

When CM<2:0> = 010:

= C1 V

IN- connects to RA3

C2 V

IN- connects to RA2

= C1 V

IN- connects to RA0

C2 V

IN- connects to RA1

bit 2-0

CM<2:0>: Comparator mode.

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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