PIC18F2420/2520/4420/4520
TABLE 1-2:
PIC18F2420/2520 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Number
Pin Buffer
Type Type
Pin Name
Description
PORTC is a bidirectional I/O port.
SPDIP,
QFN
SOIC
RC0/T1OSO/T13CKI
RC0
11
12
8
9
I/O
O
I
ST
—
ST
Digital I/O.
Timer1 oscillator output.
Timer1/Timer3 external clock input.
T1OSO
T13CKI
RC1/T1OSI/CCP2
RC1
I/O
I
I/O
ST
Analog
ST
Digital I/O.
Timer1 oscillator input.
Capture 2 input/Compare 2 output/PWM2 output.
T1OSI
CCP2(2)
RC2/CCP1
RC2
13
14
10
11
I/O
I/O
ST
ST
Digital I/O.
CCP1
Capture 1 input/Compare 1 output/PWM1 output.
RC3/SCK/SCL
RC3
I/O
I/O
I/O
ST
ST
ST
Digital I/O.
SCK
SCL
Synchronous serial clock input/output for SPI mode.
Synchronous serial clock input/output for I2C™ mode.
RC4/SDI/SDA
RC4
15
12
I/O
I
I/O
ST
ST
ST
Digital I/O.
SPI data in.
I2C data I/O.
SDI
SDA
RC5/SDO
RC5
16
17
13
14
I/O
O
ST
—
Digital I/O.
SPI data out.
SDO
RC6/TX/CK
RC6
I/O
O
I/O
ST
—
ST
Digital I/O.
TX
CK
EUSART asynchronous transmit.
EUSART synchronous clock (see related RX/DT).
RC7/RX/DT
RC7
18
—
15
—
I/O
I
I/O
ST
ST
ST
Digital I/O.
RX
DT
EUSART asynchronous receive.
EUSART synchronous data (see related TX/CK).
RE3
VSS
VDD
—
P
—
—
—
See MCLR/VPP/RE3 pin.
8, 19 5, 16
20 17
Ground reference for logic and I/O pins.
Positive supply for logic and I/O pins.
CMOS = CMOS compatible input or output
P
Legend: TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
= Output
I
= Input
O
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.
© 2008 Microchip Technology Inc.
DS39631E-page 15
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