Name
Pin #
Type
Section
Pin Group
Orientation
Order
Sub-symbol
PD3
1
Bi-Directional
GPIO
PD
Right
PD4
2
Bi-Directional
GPIO
PD
Right
NC
3
Not Connected
No Connect
Left
VCC
4
Power In
Power
Top
GND
5
Power In
Power
Bottom
NC
6
Not Connected
No Connect
Left
XTAL1
7
Input
Clock
Left
XTAL2
8
Output
Clock
Left
PD5
9
Bi-Directional
GPIO
PD
Right
PD6
10
Bi-Directional
GPIO
PD
Right
PD7
11
Bi-Directional
GPIO
PD
Right
PB0
12
Bi-Directional
GPIO
PB
Right
PB1
13
Bi-Directional
GPIO
PB
Right
PB2
14
Bi-Directional
GPIO
PB
Right
PB3
15
Bi-Directional
GPIO
PB
Right
PB4
16
Bi-Directional
GPIO
PB
Right
PB5
17
Bi-Directional
GPIO
PB
Right
VCC
18
Passive
Power
Top
NC
19
Not Connected
No Connect
Left
NC
20
Not Connected
No Connect
Left
GND
21
Passive
Power
Bottom
NC
22
Not Connected
No Connect
Left
PB6
23
Bi-Directional
GPIO
PB
Right
ATtiny28L-4A
