Multiplexed Signals

Table 1. PORT Function Multiplexing
SOIC 8-Pin	Pin Name ^(1,2)	Other/Special	ADC0	AC0	DAC0	USART0	SPI0	TWI0	TCA0	TCB0	TCD0	CCL
6	PA0	RESET/UPDI	AIN0			XDIR	SS					LUT0-IN0
4	PA1		AIN1			TxD⁽³⁾	MOSI	SDA	WO1			LUT0-IN1
5	PA2	EVOUT0	AIN2			RxD⁽³⁾	MISO	SCL	WO2			LUT0-IN2
7	PA3	EXTCLK	AIN3	OUT		XCK	SCK		WO0/WO3
8	GND
1	VDD
2	PA6		AIN6	AINN0	OUT	TxD	MOSI⁽³⁾			WO0	WOA	LUT0-OUT
3	PA7		AIN7	AINP0		RxD	MISO⁽³⁾		WO0⁽³⁾		WOB	LUT1-OUT

Note:

1.Pins names are of type Pxn, with x being the PORT instance and n the pin number. Notation for signals is PORTx_PINn. All pins can be used as event input.
2.All pins can be used for external interrupt, where pins Px2 and Px6 of each port have full asynchronous detection.
3.Alternate pin positions. For selecting the alternate positions, refer to the PORTMUX documentation.