Datasheet

 2010 Microchip Technology Inc. Preliminary DS41350E-page 13
PIC18F1XK50/PIC18LF1XK50
TABLE 1-2: PIC18F/LF1XK50 PINOUT I/O DESCRIPTIONS
Pin Name
Pin
Number
Pin
Type
Buffer
Type
Description
RA0/D+/PGD
RA0
D+
PGD
19
I
I/O
I/O
TTL
XCVR
ST
Digital input
USB differential plus line (input/output)
ICSP™ programming data pin
RA1/D-/PGC
RA1
D-
PGC
18
I
I/O
I/O
TTL
XCVR
ST
Digital input
USB differential minus line (input/output)
ICSP™ programming clock pin
RA3/MCLR
/VPP
RA3
MCLR
VPP
4
I
I
P
ST
ST
—
Master Clear (input) or programming voltage (input)
Digital input
Active-low Master Clear with internal pull-up
High voltage programming input
RA4/AN3/OSC2/CLKOUT
RA4
AN3
OSC2
CLKOUT
3
I/O
I
O
O
TTL
Analog
XTAL
CMOS
Digital I/O
ADC channel 3
Oscillator crystal output. Connect to crystal or resonator
in Crystal Oscillator mode
In RC mode, OSC2 pin outputs CLKOUT which
has 1/4 the frequency of OSC1 and denotes
the instruction cycle rate
RA5/OSC1/CLKIN
RA5
OSC1
CLKIN
2
I/O
I
I
TTL
XTAL
CMOS
Digital I/O
Oscillator crystal input or external clock input
ST buffer when configured in RC mode; analog other
wise
External clock source input. Always associated with the
pin function OSC1 (See related OSC1/CLKIN, OSC2,
CLKOUT pins
RB4/AN10/SDI/SDA
RB4
AN10
SDI
SDA
13
I/O
I
I
I/O
TTL
Analog
ST
ST
Digital I/O
ADC channel 10
SPI data in
I
2
C™ data I/O
RB5/AN11/RX/DT
RB5
AN11
RX
DT
12
I/O
I
I
I/O
TLL
Analog
ST
ST
Digital I/O
ADC channel 11
EUSART asynchronous receive
EUSART synchronous data (see related RX/TX)
RB6/SCK/SCI
RB6
SCK
SCI
11
I/O
I/O
I/O
TLL
ST
ST
Digital I/O
Synchronous serial clock input/output for SPI mode
Synchronous serial clock input/output for I
2
C™ mode
RB7/TX/CK
RB7
TX
CK
10
I/O
O
I/O
TLL
CMOS
ST
Digital I/O
EUSART asynchronous transmit
EUSART synchronous clock (see related RX/DT)
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input I = Input
O = Output P = Power
XTAL= Crystal Oscillator XCVR = USB Differential Transceiver