PIC18F23K20 Datasheet, PDF (16/420 Pages) Microchip Technology – 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2XK20/4XK20
TABLE 1-2: PIC18F2XK20 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
PDIP,
SOIC
QFN
Type
Type
Description
MCLR/VPP/RE3
MCLR
VPP
RE3
1 26
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
9
6
Oscillator crystal or external clock input
I ST
Oscillator crystal input or external clock source input
ST buffer when configured in RC mode; CMOS 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
OSC2
CLKOUT
RA6
10 7
Oscillator crystal or clock output
O—
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode
O—
In RC mode, OSC2 pin outputs CLKOUT which has 1/4 the
frequency of OSC1 and denotes the instruction cycle rate
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.
DS41303B-page 14
Advance Information
© 2007 Microchip Technology Inc.