Datasheet

PIC18F6520/8520/6620/8620/6720/8720
DS39609C-page 12  2003-2013 Microchip Technology Inc.
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
24 30
I/O
I
TTL
Analog
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
23 29
I/O
I
TTL
Analog
Digital I/O.
Analog input 1.
RA2/AN2/V
REF-
RA2
AN2
V
REF-
22 28
I/O
I
I
TTL
Analog
Analog
Digital I/O.
Analog input 2.
A/D reference voltage (Low) input.
RA3/AN3/VREF+
RA3
AN3
V
REF+
21 27
I/O
I
I
TTL
Analog
Analog
Digital I/O.
Analog input 3.
A/D reference voltage (High) input.
RA4/T0CKI
RA4
T0CKI
28 34
I/O
I
ST/OD
ST
Digital I/O – Open-drain when
configured as output.
Timer0 external clock input.
RA5/AN4/LVDIN
RA5
AN4
LVDIN
27 33
I/O
I
I
TTL
Analog
Analog
Digital I/O.
Analog input 4.
Low-Voltage Detect input.
RA6 See the OSC2/CLKO/RA6 pin.
TABLE 1-2: PIC18FXX20 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
PIC18F6X20 PIC18F8X20
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I = Input O = Output
P = Power OD = Open-Drain (no P diode to V
DD)
Note 1: Alternate assignment for CCP2 when CCP2MX is not selected (all operating modes except
Microcontroller).
2: Default assignment when CCP2MX is set.
3: External memory interface functions are only available on PIC18F8X20 devices.
4: CCP2 is multiplexed with this pin by default when configured in Microcontroller mode. Otherwise, it is
multiplexed with either RB3 or RC1.
5: PORTH and PORTJ are only available on PIC18F8X20 (80-pin) devices.
6: AV
DD must be connected to a positive supply and AVSS must be connected to a ground reference for
proper operation of the part in user or ICSP modes. See parameter D001A for details.