ATmega48PB/88PB/168PB

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
No	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

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