Datasheet
...........continued
Pin I/O Pin Supply A B
(1)(2)
C D E F G H
SAMD21ExL SAMD21GxL EIC REF ADC AC AC1 DAC SERCOM
(1)(2)
SERCOM-ALT
(7)
TC
(3)
/TCC
TCC COM AC/
GCLK
15 23 PA14 VDDIO EXTINT[14] SERCOM2/
PAD[2]
SERCOM4/
PAD[2]
TC3/WO[0] TCC0/
WO[4]
GCLK_IO[0]
16 24 PA15 VDDIO EXTINT[15] SERCOM2/
PAD[3]
SERCOM4/
PAD[3]
TC3/WO[1] TCC0/
WO[5]
GCLK_IO[1]
17 25 PA16 VDDIO EXTINT[0] SERCOM1/
PAD[0]
SERCOM3/
PAD[0]
TCC2/WO[0] TCC0/WO[6] GCLK_IO[2]
18 26 PA17 VDDIO EXTINT[1] SERCOM1/
PAD[1]
SERCOM3/
PAD[1]
TCC2/WO[1] TCC0/WO[7] GCLK_IO[3]
19 27 PA18 VDDIO EXTINT[2] SERCOM1/
PAD[2]
SERCOM3/
PAD[2]
TC3/WO[0] TCC0/
WO[2]
AC/CMP[0]
20 28 PA19 VDDIO EXTINT[3] SERCOM1/
PAD[3]
SERCOM3/
PAD[3]
TC3/WO[1] TCC0/
WO[3]
AC/CMP[1]
29 PA20 VDDIO EXTINT[4] SERCOM5/
PAD[2]
SERCOM3/
PAD[2]
TC7/WO[0] TCC0/
WO[6]
GCLK_IO[4]
30 PA21 VDDIO EXTINT[5] SERCOM5/
PAD[3]
SERCOM3/
PAD[3]
TC7/WO[1] TCC0/
WO[7]
GCLK_IO[5]
21 31 PA22 VDDIO EXTINT[6] SERCOM3/
PAD[0]
SERCOM5/
PAD[0]
TC4/WO[0] TCC0/
WO[4]
GCLK_IO[6]
22 32 PA23 VDDIO EXTINT[7] SERCOM3/
PAD[1]
SERCOM5/
PAD[1]
TC4/WO[1] TCC0/
WO[5]
GCLK_IO[7]
23 33 PA24
(5)
VDDIO EXTINT[12] SERCOM3/
PAD[2]
SERCOM5/
PAD[2]
TC5/WO[0] TCC1/
WO[2]
AC1/CMP[0]
24 34 PA25
(5)
VDDIO EXTINT[13] SERCOM3/
PAD[3]
SERCOM5/
PAD[3]
TC5/WO[1] TCC1/
WO[3]
AC1/CMP[1]
37 PA27 VDDIO EXTINT[15] TCC3/
WO[6]
GCLK_IO[0]
39 PA28 VDDIO EXTINT[8] TCC3/
WO[7]
GCLK_IO[0]
29 43 PA30 VDDIO EXTINT[10] SERCOM1/
PAD[2]
TCC1/WO[0] TCC3/
WO[4]
SWCLK GCLK_IO[0]
30 44 PA31 VDDIO EXTINT[11] SERCOM1/
PAD[3]
TCC1/WO[1] TCC3/
WO[5]
SWDIO
(5)
45 PB00 AIN[8]
46 PB01 AIN[9]
31 47 PB02 VDDANA EXTINT[2] AIN[10] AIN[2] SERCOM5/
PAD[0]
TC6/WO[0]
(6)
TCC3/
WO[2]
32 48 PB03 VDDANA EXTINT[3] AIN[11] AIN[3] SERCOM5/
PAD[1]
TC6/WO[1]
(6)
TCC3/
WO[3]
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. Only some pins can be used in SERCOM I
2
C mode.
3. Note that TC6 and TC7 are not supported on the SAM D21ExL and SAM D21GxL devices. Refer to
2. Configuration Summary for details.
4. This function is only activated in the presence of a debugger.
5. If the PA24 and PA25 pins are not connected, it is recommended to enable a pull-up on PA24 and
PA25 through input GPIO mode. The aim is to avoid an eventually extract power consumption
(<1mA) due to a not stable level on pad. The port PA24 and PA25 doesn't have Drive Strength
option.
6. TC6 is only available on the SAM D21GxL and not the SAM D21ExL.
7. SERCOM4 and SERCOM5 are not supported on the SAM D21E devices. Refer to 2. Configuration
Summary for details.
Related Links
SAM D21 Family
I/O Multiplexing and Considerations
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 31