Multiplexed Signals

Table 1. PORT Function Multiplexing
SOIC 8-pin Pin Name (1,2) Other/Special ADC0 AC0 USART0 SPI0 TWI0 TCA0 TCB0 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 TxD MOSI(3)     WO0 LUT0-OUT
3 PA7   AIN7 AINP0 RxD MISO(3)   WO0(3)   LUT1-OUT
Note:
  1. 1.Pin names are of type Pxn, with x being the PORT instance (A, B) and n the pin number. Notation for signals is PORTx_PINn. All pins can be used as event input.
  2. 2.All pins can be used for external interrupt, where pins Px2 and Px6 of each port have full asynchronous detection.
  3. 3.Alternate pin positions. For selecting the alternate positions, refer to the PORTMUX documentation.