PIC18F25K20T-ISS Datasheet, PDF (20/456 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

PIC18F2XK20/4XK20
TABLE 1-3: PIC18F4XK20 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
PDIP QFN TQFP ^{Type Type}
Description
MCLR/VPP/RE3
MCLR
VPP
RE3
1 18 18
Master Clear (input) or programming voltage (input)
I
ST
Active-low Master Clear (device Reset) input
P
Programming voltage input
I
ST
Digital input
OSC1/CLKIN/RA7
OSC1
CLKIN
RA7
13 32 30
Oscillator crystal or external clock input
I
ST
Oscillator crystal input or external clock source input
ST buffer when configured in RC mode;
analog otherwise
I CMOS External clock source input. Always associated with
pin function OSC1 (See related OSC1/CLKIN,
OSC2/CLKOUT pins)
I/O TTL General purpose I/O pin
OSC2/CLKOUT/RA6 14 33 31
Oscillator crystal or clock output
OSC2
O
—
Oscillator crystal output. Connects to crystal
or resonator in Crystal Oscillator mode
CLKOUT
O
—
In RC mode, OSC2 pin outputs CLKOUT which
has 1/4 the frequency of OSC1 and denotes
the instruction cycle rate
RA6
I/O TTL General purpose I/O pin
Legend: TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
O = Output
CMOS = CMOS compatible input or output
I
= Input
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.
DS41303G-page 20
 2010 Microchip Technology Inc.