Datasheet

6. I/O Multiplexing

Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be

assigned to one of the peripheral functions.

The following table describes the peripheral signals multiplexed to the PORT I/O pins.

Table 6-1. 32-Pin TQFP and MLF: PORT Function Multiplexing

PAD32 EXTINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI

1 PD[3] INT1

2 PD[4] T0 XCK0

3 GND

4 VCC

5 GND

6 VCC

7 PB[6] XTAL1/TOSC1

8 PB[7] XTAL2/TOSC2

9 PD[5] T1

10 PD[6] AIN0

11 PD[7] AIN1

12 PB[0] ICP1

13 PB[1] OC1A

14 PB[2] OC1B SS0

15 PB[3] OC2 MOSI0

16 PB[4] MISO0

17 PB[5] SCK0

18 AVCC

19 ADC6 ADC6

20 AREF

21 GND

22 ADC7 ADC7

23 PC[0] ADC0

24 PC[1] ADC1

25 PC[2] ADC2

26 PC[3] ADC3

27 PC[4] ADC4 SDA0

28 PC[5] ADC5 SCL0

29 PC[6]/RESET

30 PD[0] RXD0

AVR 8-Bit Microcontroller

I/O Multiplexing

Datasheet Complete

40001974A-page 20