3.1 I/O Multiplexing

VQFN20SOIC20SOIC14Pin name (1,2)SpecialADC0AC0DAC0ZCD3USARTnSPI0TWI0(4)TCA0TCBnTCD0EVSYSCCL-LUTn
1744PA0

XTAL32K1

XTALHF1

EXTCLK

0,TxD SDA(H)(3)WO0

0,IN0

1855PA1

XTAL32K2

XTALHF2

0,RxD SCL(H)(3)WO1

0,IN1

196PA2

TWI

Fm+
AIN22

0,XCK

0,TxD(3)

SDA(H)

WO20,WOEVOUTA

0,IN2

207PA3

TWI

Fm+
AIN23

0,XDIR

0,RxD(3)

SCL(H)

WO31,WO0,OUT
18PA4AIN240,TxD(3)MOSIWO4

WOA

29PA5AIN250,RxD(3)MISOWO5

WOB

310PA6AIN260,XCK(3)SCKWOC0,OUT(3)
411PA7CLKOUTAIN27OUTZCOUT0,XDIR(3)SSWODEVOUTA(3)
5126PC1AIN29(6)

1,RxD

0,TxD(3)

MISO(3)

MOSI(3)

WO1(3)

1,IN1

6137PC2

TWI

Fm+
AIN30(6)AINN3(6)ZCIN

1,XCK

0,RxD(3)

SCK(3)

MISO(3)

SDA(C)

SDA(H)(3)

WO2(3)EVOUTC

1,IN2

7148PC3

TWI

Fm+
AIN31(6)AINP4(6)

1,XDIR

0,XCK(3)

SS(3)

SCK(3)

SCL(C)

SCL(H)(3)

WO3(3)1,OUT
8159VDDIO2
91610PD4AIN40,TxD(3)MOSI(3)WO4(3)WOC(3)
101711PD5AIN50,RxD(3)MISO(3)WO5(3)WOD(3)
111812PD6AIN6AINP3VOUT

0,XCK(3)

1,TxD(3)

SCK(3)2,OUT(3)
121913PD7VREFAAIN7AINN2

0,XDIR(3)

1,RxD(3)

SS(3)EVOUTD(3)
132014VDD
1411GND
1522PF6(5)RESET
1633PF7UPDI

SS(3)

EVOUTF(3)
Note:
  1. The pin names are Pxn type, with x being the PORT instance (A, B, C, ...) and n, the pin number. The notation for signals is PORTx_PINn. All pins can be used as event input.
  2. All pins can be used for external interrupt.
  3. Alternate pin positions. Refer to the PORTMUX - Port Multiplexer section for selecting the alternate positions.
  4. The TWI pins that can be used as host or client are marked H. The pins with client-only are marked C.
  5. Input-only.
  6. ADC and AC inputs are available on MVIO pins (PORTC) if the MVIO is disabled in the SYSCFG1.MVSYSCFG fuse setting.