PIC18F2221 MICROCHIP [Microchip Technology], PIC18F2221 Datasheet - Page 18

• Manufacturer Part Number: PIC18F2221
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F4321 FAMILY
TABLE 1-3:
DS39689E-page 16
MCLR/V
OSC1/CLKI/RA7
OSC2/CLKO/RA6
Legend: TTL = TTL compatible input
Note 1:
MCLR
V
RE3
OSC1
CLKI
RA7
OSC2
CLKO
RA6
PP
2:
3:
Pin Name
PP
ST = Schmitt Trigger input with CMOS levels
I
Default assignment for CCP2 when Configuration bit, CCP2MX, is set.
Alternate assignment for CCP2 when Configuration bit, CCP2MX, is cleared.
Special ICPORT features available in select circumstances. See Section 23.9 “Special ICPORT Features
(44-Pin TQFP Packages Only)” for more information.
/RE3
2
C = ST with I
PIC18F4221/4321 PINOUT I/O DESCRIPTIONS
PDIP
13
14
2
1
C™ or SMB levels
Pin Number
QFN TQFP
18
32
33
18
30
31
Type
Pin
I/O
I/O
O
O
P
I
I
I
I
Preliminary
Analog
Analog
Buffer
Type
TTL
TTL
ST
ST
—
—
Master Clear (input) or programming voltage (input).
Oscillator crystal or external clock input.
Oscillator crystal or clock output.
CMOS = CMOS compatible input or output
I
O
Master Clear (Reset) input. This pin is an active-low
Reset to the device.
Programming voltage input.
Digital input.
Oscillator crystal input or external clock source input.
ST buffer when configured in RC mode;
analog otherwise.
External clock source input. Always associated with
pin function OSC1. (See related OSC1/CLKI,
OSC2/CLKO pins.)
General purpose I/O pin.
Oscillator crystal output. Connects to crystal
or resonator in Crystal Oscillator mode.
In RC, EC and INTIO modes, OSC2 pin outputs
CLKO which has one-fourth the frequency of OSC1
and denotes the instruction cycle rate.
General purpose I/O pin.
= Input
= Output
Description
© 2007 Microchip Technology Inc.
P = Power