ATmega16

1

PB0(XCK/T0)

Pin 0 of  PORTB

T0( Timer0 External Counter Input)

XCK ( USART External Clock I/O)

2

PB1(T1)

Pin 1 of  PORTB

T1(Timer1 External Counter Input)

3

PB2(INT2/AIN0)

Pin 2 of  PORTB

AIN0(Internal Analog Comparator Positive Input)

INT2( External Interrupt 2 Input)

4

PB3(OC0/AIN1)

Pin 3 of  PORTB

AIN1(Internal Analog Comparator Negative Input)

 OC0 (Timer0 Output Compare Match Output) or  PWM output

5

PB4(SS )

Pin 4 of  PORTB

SS (SPI Slave Select Input).  This pin is low when controller acts as slave.

[Serial Peripheral Interface (SPI) for programming]

6

PB5(MOSI)

Pin 5 of  PORTB

MOSI (Master Output Slave Input). When controller acts as slave, the data is received by this pin.

[Serial Peripheral Interface (SPI) for programming]

7

PB6(MISO)

Pin 6 of  PORTB

MISO (Master Input Slave Output). When controller acts as slave, the data is sent to master through this pin.

 [Serial Peripheral Interface (SPI) for programming]

8

PB7(SCK)

Pin 7 of  PORTB

SCK (SPI Bus Serial Clock). This is the clock shared between this controller and other system for accurate data transfer.

[Serial Peripheral Interface (SPI) for programming]

9

RESET 

Reset Pin (Active Low Reset)

10

VCC

Connected to +5V

11

GND

Connected to GROUND

12

XTAL2

Connected to Crystal Oscillator

13

XTAL1

Connected to Crystal Oscillator

14

PD0(RXD)

Pin 0 of  PORTD

RXD (USART Input Pin)

[USART Serial Communication Interface

can be used for programming]

15

PD1(TXD)

Pin 1 of  PORTD

TXD (USART Output Pin)

[USART Serial Communication Interface

can be used for programming]

16

PD2(INT0)

Pin 2 of  PORTD

External Interrupt INT0

17

PD3(INT1)

Pin 3 of  PORTD

External Interrupt INT1

18

PD4(OC1B)

Pin 4 of  PORTD

OC1B (Timer Output Compare Match Output) or  PWM output

19

PD5(OC1A)

Pin 5 of  PORTD

OC1A (Timer Output Compare Match Output) or  PWM output

20

PD6(ICP)

Pin 6 of  PORTD

Timer/Counter1 Input Capture Pin

21

PD7 (OC2)

Pin 7 of  PORTD

Timer/Counter2 Output Compare Match Output

22

PC0 (SCL)

Pin 0 of  PORTC

TWI Interface

23

PC1 (SDA)

Pin 1 of  PORTC

TWI Interface

24

PC2 (TCK)

Pin 2 of  PORTC

JTAG Interface

25

PC3 (TMS)

Pin 3 of  PORTC

JTAG Interface

26

PC4 (TDO)

Pin 4 of  PORTC

JTAG Interface

27

PC5 (TDI)

Pin 5 of  PORTC

JTAG Interface

28

PC6 (TOSC1)

Pin 6 of  PORTC

Timer Oscillator Pin 1

29

PC7 (TOSC2)

Pin 7 of  PORTC

Timer Oscillator Pin 2

30

AVcc

Vcc for Internal ADC  Converter

31

GND

GROUND

32

AREF

Analog Reference Pin for ADC

33

PA7 (ADC7)

Pin 7 of  PORTA

ADC (Analog to Digital Converter) Channel 7

34

PA6 (ADC6)

Pin 6 of  PORTA

ADC (Analog to Digital Converter) Channel 6

35

PA5 (ADC5)

Pin 5 of  PORTA

ADC (Analog to Digital Converter) Channel 5

36

PA4 (ADC4)

Pin 4 of  PORTA

ADC (Analog to Digital Converter) Channel 4

37

PA3 (ADC3)

Pin 3 of  PORTA

ADC (Analog to Digital Converter) Channel 3

38

PA2 (ADC2)

Pin 2 of  PORTA

ADC (Analog to Digital Converter) Channel 2

39

PA1 (ADC1)

Pin 1 of  PORTA

ADC (Analog to Digital Converter) Channel 1

40

PA0 (ADC0)

Pin 0 of  PORTA

ADC (Analog to Digital Converter) Channel 0