PIC16F636T-I Datasheet, PDF (77/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
FIGURE 7-7:
COMPARATOR I/O OPERATING MODES (PIC16F636/639)
Comparators Reset (POR Default Value)
CM<2:0> = 000
Two Independent Comparators
CM<2:0> = 100
C1IN- ^A
C1IN+ ^A
VIN-
VIN+ ^C1
Off⁽¹⁾
C1IN- ^A
C1IN+ ^A
VIN-
VIN+ ^C1
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
Off⁽¹⁾
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
Three Inputs Multiplexed to Two Comparators
CM<2:0> = 001
C1IN- ^A
C1IN+ ^A
CIS = 0 VIN-
CIS = 1 _{VIN+ C1}
C1OUT
One Independent Comparator
CM<2:0> = 101
C1IN- ^I/O
C1IN+ ^I/O
VIN-
VIN+ ^C1
C1OUT
C2OUT
Off⁽¹⁾
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
C2OUT
Four Inputs Multiplexed to Two Comparators
CM<2:0> = 010
C1IN- ^A
C1IN+ ^A
CIS = 0
CIS = 1
VIN-
VIN+ ^C1
C1OUT
C2IN- ^A
C2IN+ ^A
CIS = 0
CIS = 1
VIN-
VIN+ ^C2
C2OUT
From CVREF Module
Two Common Reference Comparators
CM<2:0> = 011
C1IN- ^A
C1IN+ ^I/O
VIN-
VIN+ ^C1
C1OUT
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
C2OUT
Two Common Reference Comparators with Outputs
CM<2:0> = 110
C1IN- ^A
VIN-
VIN+ ^C1
C1OUT
C1OUT(pin) ^D
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
C2OUT
C2OUT(pin) ^D
Comparators Off (Lowest Power)
CM<2:0> = 111
C1IN- ^I/O
C1IN+ ^I/O
VIN-
VIN+ ^C1
Off⁽¹⁾
C2IN- ^A
C2IN+ ^A
VIN-
VIN+ ^C2
C2OUT
Legend: A = Analog Input, ports always reads ‘0’
I/O = Normal port I/O
Note 1: Reads as ‘0’, unless CxINV = 1.
C2IN- ^I/O
C2IN+ ^I/O
VIN-
VIN+ ^C2
Off⁽¹⁾
CIS = Comparator Input Switch (CMCON0<3>)
D = Comparator Digital Output
© 2007 Microchip Technology Inc.
DS41232D-page 75