
PIC18F2221/2321/4221/4321 FAMILY
DS39689F-page 4
2009 Microchip Technology Inc.
Pin Diagrams
PIC
18F2
3
21
10
11
2
3
4
5
6
1
8
7
9
12
13
14
15
16
17
18
19
20
23
24
25
26
27
28
22
21
MCLR/VPP/RE3
RA0/AN0
RA1/AN1
RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+
RA4/T0CKI/C1OUT
RA5/AN4/SS/HLVDIN/C2OUT
VSS
OSC1/CLKI/RA7
OSC2/CLKO/RA6
RC0/T1OSO/T13CKI
RC1/T1OSI/CCP2
RC2/CCP1
RC3/SCK/SCL
RB7/KBI3/PGD
RB6//KBI2/PGC
RB5/KBI1/PGM
RB4/KBI0/AN11
RB3/AN9/CCP2
RB2/INT2/AN8
RB1/INT1/AN10
RB0/INT0/FLT0/AN12
VDD
VSS
RC7/RX/DT
RC6/TX/CK
RC5/SDO
RC4/SDI/SDA
28-Pin SPDIP, SOIC, SSOP
PIC
18F2
2
21
28-Pin QFN
10 11
2
3
6
1
18
19
20
21
22
12 13 14
15
8
7
16
17
23
24
25
26
27
28
9
PIC18F2221
R
C
0/T
1O
S
O
/T
13C
K
I
5
4
RB7
/KBI
3/
PG
D
RB6
/KBI
2/
PG
C
RB5
/KBI
1/
PG
M
RB4
/KBI
0/
AN1
1
RB3/AN9/CCP2(1)
RB2/INT2/AN8
RB1/INT1/AN10
RB0/INT0/FLT0/AN12
VDD
VSS
RC7/RX/DT
RC6
/T
X/C
K
RC5
/SDO
RC4
/SDI/
S
D
A
MC
LR
/V
PP
/RE
3
RA0
/AN0
RA1
/AN1
RA2/AN2/VREF-/CVREF
RA3/AN3/VREF+
RA4/T0CKI/C1OUT
RA5/AN4/SS/HLVDIN/C2OUT
VSS
OSC1/CLKI/RA7
OSC2/CLKO/RA6
RC1
/T
1
O
SI/CCP2
(1
)
RC2
/CCP1
R
C
3/
SCK/
SCL
Note 1:
RB3 is the alternate pin for CCP2 multiplexing.
PIC18F2321