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. PORT Function Multiplexing

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

1 PD[3] INT1 PCINT19 OC2B

2 PD[4] PCINT20 T0 XCK

3 PE[0] ACO

4 VCC

5 GND

6 PE[1]

7 PB[6] PCINT6 XTAL1/TOSC1

8 PB[7] PCINT7 XTAL2/TOSC2

9 PD[5] PCINT21 OC0B T1

10 PD[6] PCINT22 AIN0 OC0A

11 PD[7] PCINT23 AIN1

12 PB[0] PCINT0 CLKO ICP1

13 PB[1] PCINT1 OC1A

14 PB[2] PCINT2 OC1B SS

15 PB[3] PCINT3 OC2A MOSI

16 PB[4] PCINT4 MISO

17 PB[5] PCINT5 SCK

18 AVCC

19 PE[2] ADC6

20 AREF

21 GND

22 PE[3] ADC7

23 PC[0] PCINT8 ADC0

24 PC[1] PCINT9 ADC1

25 PC[2] PCINT10 ADC2

26 PC[3] PCINT11 ADC3

27 PC[4] PCINT12 ADC4 SDA

28 PC[5] PCINT13 ADC5 SCL

29 PC[6]/RESET PCINT14

30 PD[0] PCINT16 RXD

31 PD[1] PCINT17 TXD

32 PD[2] INT0 PCINT18

ATmega48PB/88PB/168PB

Datasheet Summary

DS40001910A-page 14