Pin
Diagram:
Pin
Description:
Pin
No.
|
Pin name
|
Description
|
Alternate Function
|
1
|
(XCK/T0) PB0
|
I/O PORTB, Pin 0
|
T0: Timer0 External Counter Input.
XCK : USART External Clock I/O
|
2
|
(T1) PB1
|
I/O PORTB, Pin 1
|
T1:Timer1 External Counter Input
|
3
|
(INT2/AIN0) PB2
|
I/O PORTB, Pin 2
|
AIN0: Analog Comparator Positive
I/P
INT2: External Interrupt 2 Input
|
4
|
(OC0/AIN1) PB3
|
I/O PORTB, Pin 3
|
AIN1: Analog Comparator Negative
I/P
OC0 : Timer0 Output Compare Match
Output
|
5
|
(SS) PB4
|
I/O PORTB, Pin 4
|
In System Programmer (ISP)
Serial Peripheral Interface (SPI)
|
6
|
(MOSI) PB5
|
I/O PORTB, Pin 5
|
|
7
|
(MISO) PB6
|
I/O PORTB, Pin 6
|
|
8
|
(SCK) PB7
|
I/O PORTB, Pin 7
|
|
9
|
RESET
|
Reset Pin, Active Low Reset
|
|
10
|
Vcc
|
Vcc = +5V
|
|
11
|
GND
|
GROUND
|
|
12
|
XTAL2
|
Output to Inverting Oscillator
Amplifier
|
|
13
|
XTAL1
|
Input to Inverting Oscillator
Amplifier
|
|
14
|
(RXD) PD0
|
I/O PORTD, Pin 0
|
USART Serial Communication
Interface
|
15
|
(TXD) PD1
|
I/O PORTD, Pin 1
|
|
16
|
(INT0) PD2
|
I/O PORTD, Pin 2
|
External Interrupt INT0
|
17
|
(INT1) PD3
|
I/O PORTD, Pin 3
|
External Interrupt INT1
|
18
|
(OC1B) PD4
|
I/O PORTD, Pin 4
|
PWM Channel Outputs
|
19
|
(OC1A) PD5
|
I/O PORTD, Pin 5
|
|
20
|
(ICP) PD6
|
I/O PORTD, Pin 6
|
Timer/Counter1 Input Capture Pin
|
21
|
PD7 (OC2)
|
I/O PORTD, Pin 7
|
Timer/Counter2 Output Compare
Match Output
|
22
|
PC0 (SCL)
|
I/O PORTC, Pin 0
|
TWI Interface
|
23
|
PC1 (SDA)
|
I/O PORTC, Pin 1
|
|
24
|
PC2 (TCK)
|
I/O PORTC, Pin 2
|
JTAG Interface
|
25
|
PC3 (TMS)
|
I/O PORTC, Pin 3
|
|
26
|
PC4 (TDO)
|
I/O PORTC, Pin 4
|
|
27
|
PC5 (TDI)
|
I/O PORTC, Pin 5
|
|
28
|
PC6 (TOSC1)
|
I/O PORTC, Pin 6
|
Timer Oscillator Pin 1
|
29
|
PC7 (TOSC2)
|
I/O PORTC, Pin 7
|
Timer Oscillator Pin 2
|
30
|
AVcc
|
Voltage Supply = Vcc for ADC
|
|
31
|
GND
|
GROUND
|
|
32
|
AREF
|
Analog Reference Pin for ADC
|
|
33
|
PA7 (ADC7)
|
I/O PORTA, Pin 7
|
ADC Channel 7
|
34
|
PA6 (ADC6)
|
I/O PORTA, Pin 6
|
ADC Channel 6
|
35
|
I/O PORTA, Pin 5
|
ADC Channel 5
|
|
36
|
PA4 (ADC4)
|
I/O PORTA, Pin 4
|
ADC Channel 4
|
37
|
PA3 (ADC3)
|
I/O PORTA, Pin 3
|
ADC Channel 3
|
38
|
PA2 (ADC2)
|
I/O PORTA, Pin 2
|
ADC Channel 2
|
39
|
PA1 (ADC1)
|
I/O PORTA, Pin 1
|
ADC Channel 1
|
40
|
PA0 (ADC0)
|
I/O PORTA, Pin 0
|
ADC Channel 0
|
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