Pinbelegung 644

VCC  GND
VCC  GND
VCC  GND
AREF PD7
PD6  PD5
PD4  PD3
PD2  PD1
PD0  PC7
PC6  PC5 
PC4  PC3
X    PC2
PC1  PC0
PB7  PB6
PB5  PB4
PB3  PB2
PB1  PB0
PA7  PA6
PA5  PA4
PA3  PA2
PA1  PA0

Pinbelegung Atmega8 

VCC  GND
VCC  GND
VCC  GND
AREF PD7
PD6  PD5
PD4  PD3
PD2  PD1
PD0  X
X    X
X    X
X    X
X    X
X    X
PB5  PB4
PB3  PB2 
PB1  PB0
X    X
X    X
PC5  PC4
PC3  PC2
PC1  PC0


Pinbelegung Atmega 2123

VCC  GND
VCC  GND
VCC  GND
AREF X
PD6  PD5
PD4  PD3
PD2  PD1
PD0  X
X    X
X    X
X    X
X    X
PB7  PB6
PB5  PB4
PB3  PB2
PB1  PB0
X    X
X    X
X    X
X    X

Pinbelegung ATiny 12

VCC  GND
VCC  GND
VCC  GND
AREF X
X    X
X    X
X    X
X    X
X    X
X    X
X    X
X    X
PB3  PB1
PB0  PB3
PB4  X
X    X
X    X
X    X
X    X
X    X