PIC16F87T/ML 查看數據表（PDF） - Microchip Technology

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PIC16F87T/ML

18/20/28-Pin Enhanced Flash MCUs with nanoWatt Technology

Microchip Technology 

PIC16F87/88

13.0 COMPARATOR MODULE

The comparator module contains two analog

comparators. The inputs to the comparators are

multiplexed with I/O port pins RA0 through RA3, while

the outputs are multiplexed to pins RA3 and RA4. The

on-chip Voltage Reference (Section 14.0 “Comparator

Voltage Reference Module”) can also be an input to

the comparators.

The CMCON register (Register 13-1) controls the

comparator input and output multiplexors. A block

diagram of the various comparator configurations is

shown in Figure 13-1.

REGISTER 13-1:

CMCON: COMPARATOR MODULE CONTROL REGISTER (ADDRESS 9Ch)

R-0

R-0

R/W-0 R/W-0

R/W-0 R/W-1 R/W-1 R/W-1

C2OUT C1OUT C2INV C1INV

CIS

CM2

CM1

CM0

bit 7

bit 0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2-0

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-

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-

C2INV: Comparator 2 Output Inversion bit

1 = C2 output inverted

0 = C2 output not inverted

C1INV: Comparator 1 Output Inversion bit

1 = C1 output inverted

0 = C1 output not inverted

CIS: Comparator Input Switch bit

When CM2:CM0 = 001:

1 = C1 VIN- connects to RA3

0 = C1 VIN- connects to RA0

When CM2:CM0 = 010:

1 = C1 VIN- connects to RA3

C2 VIN- connects to RA2

0 = C1 VIN- connects to RA0

C2 VIN- connects to RA1

CM<2:0>: Comparator Mode bits

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared x = Bit is unknown

 2002-2013 Microchip Technology Inc.

DS30487D-page 121

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