# Multiplexed Signals

Table 1. PORT Function Multiplexing
VQFN 24-Pin VQFN 20-Pin SOIC 20-Pin SOIC 14-Pin Pin Name (1,2) Other/Special ADC0 PTC(4) AC0 DAC0 USART0 SPI0 TWI0 TCA0 TCB0 TCD0 CCL
23 19 16 10 PA0 RESET/ UPDI AIN0                   LUT0-IN0
24 20 17 11 PA1   AIN1       TxD(3) MOSI SDA(3)       LUT0-IN1
1 1 18 12 PA2 EVOUT0 AIN2       RxD(3) MISO SCL(3)       LUT0-IN2
2 2 19 13 PA3 EXTCLK AIN3       XCK(3) SCK   WO3
3 3 20 14 GND
4 4 1 1 VDD
5 5 2 2 PA4   AIN4 X0/Y0     XDIR(3) SS   WO4   WOA LUT0-OUT
6 6 3 3 PA5   AIN5 X1/Y1 OUT         WO5 WO WOB
7 7 4 4 PA6   AIN6 X2/Y2 AINN0 OUT
8 8 5 5 PA7   AIN7 X3/Y3 AINP0               LUT1-OUT
9       PB7
10       PB6
11 9 6   PB5 CLKOUT AIN8   AINP1         WO2(3)
12 10 7   PB4   AIN9   AINN1         WO1(3)     LUT0-OUT(3)
13 11 8 6 PB3

TOSC1

RxD     WO0(3)
14 12 9 7 PB2 TOSC2, EVOUT1         TxD     WO2
15 13 10 8 PB1   AIN10 X4/Y4     XCK   SDA WO1
16 14 11 9 PB0   AIN11 X5/Y5     XDIR   SCL WO0
17 15 12   PC0             SCK(3)     WO(3) WOC
18 16 13   PC1             MISO(3)       WOD LUT1-OUT(3)
19 17 14   PC2 EVOUT2           MOSI(3)
20 18 15   PC3             SS(3)   WO3(3)     LUT1-IN0
21       PC4                 WO4(3)   LUT1-IN1
22       PC5                 WO5(3)     LUT1-IN2
Notes:
1. 1.Pin names are of type Pxn, with x being the PORT instance (A, B) and n the pin number. The 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 section PORTMUX - Port Multiplexer.
4. 4.PTC is only available in devices with 8 KB Flash or more. Every PTC line can be configured as X- or Y-line.