Datasheet

 2010 Microchip Technology Inc. DS41303G-page 21
PIC18F2XK20/4XK20
PORTA is a bidirectional I/O port.
RA0/AN0/C12IN0-
RA0
AN0
C12IN0-
21919
I/O
I
I
TTL
Analog
Analog
Digital I/O
Analog input 0, ADC channel 0
Comparator C1 and C2 inverting input
RA1/AN1/C12IN0-
RA1
AN1
C12IN0-
32020
I/O
I
I
TTL
Analog
Analog
Digital I/O
Analog input 1, ADC channel 1
Comparator C1 and C2 inverting input
RA2/AN2/V
REF-/CVREF/
C2IN+
RA2
AN2
V
REF-
CV
REF
C2IN+
42121
I/O
I
I
O
I
TTL
Analog
Analog
Analog
Analog
Digital I/O
Analog input 2, ADC channel 2
A/D reference voltage (low) input
Comparator reference voltage output
Comparator C2 non-inverting input
RA3/AN3/V
REF+/
C1IN+
RA3
AN3
VREF+
C1IN+
52222
I/O
I
I
I
TTL
Analog
Analog
Analog
Digital I/O
Analog input 3, ADC channel 3
A/D reference voltage (high) input
Comparator C1 non-inverting input
RA4/T0CKI/C1OUT
RA4
T0CKI
C1OUT
62323
I/O
I
O
ST
ST
CMOS
Digital I/O
Timer0 external clock input
Comparator C1 output
RA5/AN4/SS
/HLVDIN/
C2OUT
RA5
AN4
SS
HLVDIN
C2OUT
72424
I/O
I
I
I
O
TTL
Analog
TTL
Analog
CMOS
Digital I/O
Analog input 4, ADC channel 4
SPI slave select input
High/Low-Voltage Detect input
Comparator C2 output
RA6 See the OSC2/CLKOUT/RA6 pin
RA7 See the OSC1/CLKIN/RA7 pin
TABLE 1-3: PIC18F4XK20 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
PDIP QFN TQFP
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels I = Input
O = Output P = Power
Note 1: Default assignment for CCP2 when Configuration bit CCP2MX is set.
2: Alternate assignment for CCP2 when Configuration bit CCP2MX is cleared.