13

Atmel | SMART SAM R21 [PRELIMINARY DATASHEET SUMMARY]

Atmel-42223AS–SAM-R21_Summary–07/2014

Notes:

1.

All analog pin functions are on peripheral function B. Peripheral function B must be selected to disable the digital control of the pin.

2.

5.2

Internal Multiplexed Signals

PA20, PB00, PB15, PB30, PB31, PC16, PC18 and PC19 are 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.

PA10, PA11, PB16 and PB17 cannot be configured as output ports. These ports are always connected to the RFCTRL

inputs.

37

PB22

VDDIO

EXTINT[6]

SERCOM5/

PAD[2]

GCLK_IO[0]

38

PB23

VDDIO

EXTINT[7]

SERCOM5/

PAD[3]

GCLK_IO[1]

25

39

PA27

VDDIO

EXTINT[15]

SERCOM3/

PAD[0]

GCLK_IO[0]

27

41

PA28

VDDIO

EXTINT[8]

SERCOM3/

PAD[1]

GCLK_IO[0]

31

45

PA30

VDDIO

EXTINT[10]

SERCOM1/

PAD[2]

TCC1/WO[0]

SWCLK GCLK_IO[0]

32

46

PA31

VDDIO

EXTINT[11]

SERCOM1/

PAD[3]

TCC1/WO[1]

47

PB02 VDDANA

EXTINT[2]

AIN[10]

Y[8]

SERCOM5/

PAD[0]

48

PB03 VDDANA

EXTINT[3]

AIN[11]

Y[9]

SERCOM5/

PAD[1]

Table 5-1.

PORT Function Multiplexing (Continued)

Pin

I/O Pin Supply Type

A

C

D

E

F

G

H

SAMR21

E

SAMR21

G

EIC

REF

ADC

AC

PTC

SERCOM

(1)(2)

SERCOM-

ALT

TC

TCC

FECTRL

TCC

SERCOM COM

AC/

GCLK

Internal

Signal

I/O Pin

Supply

Type

A

B

C

D

E

F

G

H

EIC

REF

ADC

AC

PTC

SERCOM

SERCOM-

ALT

TC

FECTRL

TCC

SERCOM

COM

AC/

GCLK

DIG3

PA10

VDDIO

Input

EXTINT[10]

DIG4

PA11

VDDIO

Input

EXTINT[11]

SLP_TR

PA20

VDDIO

I/O

IRQ

PB00

VDDANA

I/O

EXTINT[0]

RSTN

PB15

VDDIO

I/O

DIG1

PB16

VDDIO

Input

EXTINT[0]

DIG2

PB17

VDDIO

Input

EXTINT[1]

MOSI

PB30

VDDIO

I/O

SERCOM4/

PAD[2]

SEL

PB31

VDDIO

I/O

SERCOM4/

PAD[1]