| Pin |
Symbol |
Description |
| 1 |
(XCK0/T0) PB0 |
port B |
| 2 |
(T1) PB1 |
port B |
| 3 |
(INT2/AIN0) PB2 |
external interrupt 2; port B |
| 4 |
(OC0/AIN1) PB3 |
port B |
| 5 |
(SS
) PB4
|
SPI slave select; port B |
| 6 |
(MOSI) PB5 |
SPI master output/slave input; port B |
| 7 |
(MISO) PB6 |
SPI master input/slave output; port B |
| 8 |
(SCK) PB7 |
SPI master clock; port B |
| 9 |
RESET
|
reset (active low) |
| 10 |
Vcc |
supply voltage |
| 11 |
GND |
ground |
| 12 |
XTAL2 |
clock oscillator pin 2 |
| 13 |
XTAL1 |
clock oscillator pin 1 |
| 14 |
(RXD) PD0 |
UART receive; port D |
| 15 |
(TXD) PD1 |
UART transmit; port D |
| 16 |
(INT0) PD2 |
external interrupt 0; port D |
| 17 |
(INT1) PD3 |
external interrupt 1; port D |
| 18 |
(OC1B) PD4 |
port D |
| 19 |
(OC1A) PD5 |
port D |
| 20 |
(ICP1) PD6 |
port D |
| 21 |
PD7 (OC2) |
port D |
| 22 |
PC0 (SCL) |
2-wire clock line; port C |
| 23 |
PC1 (SDA) |
2-wire data line; port C |
| 24 |
PC2 (TCK) |
JTAG test clock; port C |
| 25 |
PC3 (TMS) |
JTAG test mode select; port C |
| 26 |
PC4 (TDO) |
JTAG test data output; port C |
| 27 |
PC5 (TDI) |
JTAG test data input; port C |
| 28 |
PC6 (TOSC1) |
timer oscillator pin 1; port C |
| 29 |
PC7 (TOSC2) |
timer oscillator pin 2; port C |
| 30 |
AVcc |
A/D converter supply voltage |
| 31 |
GND |
ground |
| 32 |
AREF |
analog reference for A/D converter |
| 33 |
PA7 (ADC7) |
port A |
| 34 |
PA6 (ADC6) |
port A |
| 35 |
PA5 (ADC5) |
port A |
| 36 |
PA4 (ADC4) |
port A |
| 37 |
PA3 (ADC3) |
port A |
| 38 |
PA2 (ADC2) |
port A |
| 39 |
PA1 (ADC1) |
port A |
| 40 |
PA0 (ADC0) |
port A |