Data Sheet

21
[DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
6. I/O Multiplexing and Considerations
6.1 Multiplexed Signals
Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be assigned to one of the peripheral functions A, B, C,
D, E, F, G or H. To enable a peripheral function on a pin, the Peripheral Multiplexer Enable bit in the Pin Configuration register corresponding to that pin
(PINCFGn.PMUXEN, n = 0-31) in the PORT must be written to one. The selection of peripheral function A to H is done by writing to the Peripheral
Multiplexing Odd and Even bits in the Peripheral Multiplexing register (PMUXn.PMUXE/O) in the PORT.
Table 5-1 on page 11 describes the peripheral signals multiplexed to the PORT I/O pins.
Table 6-1. PORT Function Multiplexing
Pin
(1)
I/O Pin Supply Type
A B
(2)(3)
C D E F G H
SAMD21E SAMD21GSAMD21J EIC REF ADC AC PTC DAC SERCOM
(2)(3)
SERCOM-
ALT
TC
(4)
/TCC TCC COM AC/GCLK
1 1 1 PA00 VDDANA EXTINT[0]
SERCOM1/
PAD[0]
TCC2/WO[0]
2 2 2 PA01 VDDANA EXTINT[1]
SERCOM1/
PAD[1]
TCC2/WO[1]
3 3 3 PA02 VDDANA EXTINT[2] AIN[0] Y[0] VOUT
4 4 4 PA03 VDDANA EXTINT[3]
ADC/VREFA
DAC/VREFA
AIN[1] Y[1]
5 PB04 VDDANA EXTINT[4] AIN[12] Y[10]
6 PB05 VDDANA EXTINT[5] AIN[13] Y[11]
9 PB06 VDDANA EXTINT[6] AIN[14] Y[12]
10 PB07 VDDANA EXTINT[7] AIN[15] Y[13]
7 11 PB08 VDDANA EXTINT[8] AIN[2] Y[14]
SERCOM4/
PAD[0]
TC4/WO[0]
8 12 PB09 VDDANA EXTINT[9] AIN[3] Y[15]
SERCOM4/
PAD[1]
TC4/WO[1]
5 9 13 PA04 VDDANA EXTINT[4] ADC/VREFB AIN[4] AIN[0] Y[2]
SERCOM0/
PAD[0]
TCC0/WO[0]
6 10 14 PA05 VDDANA EXTINT[5] AIN[5] AIN[1] Y[3]
SERCOM0/
PAD[1]
TCC0/WO[1]
7 11 15 PA06 VDDANA EXTINT[6] AIN[6] AIN[2] Y[4]
SERCOM0/
PAD[2]
TCC1/WO[0]
8 12 16 PA07 VDDANA EXTINT[7] AIN[7] AIN[3] Y[5]
SERCOM0/
PAD[3]
TCC1/WO[1] I2S/SD[0]
11 13 17 PA08 VDDIO I
2
C NMI AIN[16] X[0]
SERCOM0/
PAD[0]
SERCOM2/
PAD[0]
TCC0/WO[0]
TCC1/
WO[2]
I2S/SD[1]
12 14 18 PA09 VDDIO I
2
C EXTINT[9] AIN[17] X[1]
SERCOM0/
PAD[1]
SERCOM2/
PAD[1]
TCC0/WO[1]
TCC1/
WO[3]
I2S/
MCK[0]
13 15 19 PA10 VDDIO EXTINT[10] AIN[18] X[2]
SERCOM0/
PAD[2]
SERCOM2/
PAD[2]
TCC1/WO[0]
TCC0/
WO[2]
I2S/
SCK[0]
GCLK_IO[4]
14 16 20 PA11 VDDIO EXTINT[11] AIN[19] X[3]
SERCOM0/
PAD[3]
SERCOM2/
PAD[3]
TCC1/WO[1]
TCC0/
WO[3]
I2S/FS[0] GCLK_IO[5]