3.1 I/O Multiplexing
VQFN20 | SOIC20 | SOIC14 | Pin name (1,2) | Special | ADC0 | AC0 | DAC0 | ZCD3 | USARTn | SPI0 | TWI0(4) | TCA0 | TCBn | TCD0 | EVSYS | CCL-LUTn |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
17 | 4 | 4 | PA0 |
XTAL32K1 XTALHF1 EXTCLK | 0,TxD | SDA(H)(3) | WO0 |
0,IN0 | ||||||||
18 | 5 | 5 | PA1 |
XTAL32K2 XTALHF2 | 0,RxD | SCL(H)(3) | WO1 |
0,IN1 | ||||||||
19 | 6 | PA2 |
TWI Fm+ | AIN22 |
0,XCK 0,TxD(3) |
SDA(H) | WO2 | 0,WO | EVOUTA |
0,IN2 | ||||||
20 | 7 | PA3 |
TWI Fm+ | AIN23 |
0,XDIR 0,RxD(3) |
SCL(H) | WO3 | 1,WO | 0,OUT | |||||||
1 | 8 | PA4 | AIN24 | 0,TxD(3) | MOSI | WO4 |
WOA | |||||||||
2 | 9 | PA5 | AIN25 | 0,RxD(3) | MISO | WO5 |
WOB | |||||||||
3 | 10 | PA6 | AIN26 | 0,XCK(3) | SCK | WOC | 0,OUT(3) | |||||||||
4 | 11 | PA7 | CLKOUT | AIN27 | OUT | ZCOUT | 0,XDIR(3) | SS | WOD | EVOUTA(3) | ||||||
5 | 12 | 6 | PC1 | AIN29(6) |
1,RxD 0,TxD(3) |
MISO(3) MOSI(3) | WO1(3) |
1,IN1 | ||||||||
6 | 13 | 7 | PC2 |
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 | |||
7 | 14 | 8 | PC3 |
TWI Fm+ | AIN31(6) | AINP4(6) |
1,XDIR 0,XCK(3) |
SS(3) SCK(3) |
SCL(C) SCL(H)(3) | WO3(3) | 1,OUT | |||||
8 | 15 | 9 | VDDIO2 | |||||||||||||
9 | 16 | 10 | PD4 | AIN4 | 0,TxD(3) | MOSI(3) | WO4(3) | WOC(3) | ||||||||
10 | 17 | 11 | PD5 | AIN5 | 0,RxD(3) | MISO(3) | WO5(3) | WOD(3) | ||||||||
11 | 18 | 12 | PD6 | AIN6 | AINP3 | VOUT |
0,XCK(3) 1,TxD(3) | SCK(3) | 2,OUT(3) | |||||||
12 | 19 | 13 | PD7 | VREFA | AIN7 | AINN2 |
0,XDIR(3) 1,RxD(3) | SS(3) | EVOUTD(3) | |||||||
13 | 20 | 14 | VDD | |||||||||||||
14 | 1 | 1 | GND | |||||||||||||
15 | 2 | 2 | PF6(5) | RESET | ||||||||||||
16 | 3 | 3 | PF7 | UPDI |
SS(3) | EVOUTF(3) |
Note:
- 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.
- All pins can be used for external interrupt.
- Alternate pin positions. Refer to the PORTMUX - Port Multiplexer section for selecting the alternate positions.
- The TWI pins that can be used as host or client are marked H. The pins with client-only are marked C.
- Input-only.
- ADC and AC inputs are available on MVIO pins (PORTC) if the MVIO is disabled in the SYSCFG1.MVSYSCFG fuse setting.