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PIC16F684-E/P Datasheet(PDF) 57 Page - Microchip Technology

Part # PIC16F684-E/P
Description  14-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  164 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC16F684-E/P Datasheet(HTML) 57 Page - Microchip Technology

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 2004 Microchip Technology Inc.
Preliminary
DS41202C-page 55
PIC16F684
8.0
COMPARATOR MODULE
The
comparator
module
contains
two
analog
comparators. The inputs to the comparators are
multiplexed with I/O port pins RA0, RA1, RC0 and
RC1, while the outputs are multiplexed to pins RA2
and RC4. An on-chip Comparator Voltage Reference
(CVREF) can also be applied to the inputs of the
comparators.
The CMCON0 register (Register 8-1) controls the
comparator input and output multiplexers. A block
diagram of the various comparator configurations is
shown in Figure 8-3.
REGISTER 8-1:
CMCON0 – COMPARATOR CONFIGURATION REGISTER (ADDRESS: 19h)
R-0
R-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-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:
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> = 010:
1
= C1 VIN- connects to RA0/AN0
C2 VIN- connects to RC0/AN4
0
= C1 VIN- connects to RA1/AN1
C2 VIN- connects to RC1/AN5
When CM<2:0> = 001:
1
= C1 VIN- connects to RA0/AN0
0
= C1 VIN- connects to RA1/AN1
bit 2-0
CM<2:0>: Comparator Mode bits
Figure 8-3 shows the Comparator modes and CM<2:0> 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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