Datasheet
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Pin
(1)
I/O Pin Supply A B
(2)(3)
C D E F G H
SAMD21E SAMD21G SAMD21J EIC REF ADC AC PTC DAC SERCOM
(2)(3)
SERCOM-ALT TC
(4)
/TCC
TCC COM AC/
GCLK
48 64 PB03 VDDANA EXTINT[3] AIN[11] Y[9] SERCOM5/
PAD[1]
TC6/WO[1] TCC3/
WO[3]
1. Use the SAMD21J pinout muxing for WLCSP45 package.
2. All analog pin functions are on peripheral function B. Peripheral function B must be selected to
disable the digital control of the pin.
3. Only some pins can be used in SERCOM I2C mode. Refer to 7.2.3 SERCOM I2C Pins.
4. Note that TC6 and TC7 are not supported on the SAM D21E and G devices. Refer to 2.
Configuration Summary for details.
5. This function is only activated in the presence of a debugger.
6. 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.
Table 7-2. PORT Function Multiplexing for L Variant Devices
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
1 1 PA02 VDDANA EXTINT[2] AIN[0] VOUT TCC3/
WO[0]
2 2 PA03 VDDANA EXTINT[3] DAC/VREFA AIN[1] TCC3/
WO[1]
3 3 PB04 VDDANA EXTINT[4] AIN[12] AIN[0]
4 4 PB05 VDDANA EXTINT[5] AIN[13] AIN[1]
7 PB08 VDDANA EXTINT[8] AIN[2] SERCOM4/
PAD[0]
TC4/WO[0] TCC3/
WO[6]
8 PB09 VDDANA EXTINT[9] AIN[3] SERCOM4/
PAD[1]
TC4/WO[1] TCC3/
WO[7]
5 9 PA04 VDDANA EXTINT[4] ADC/VREFB AIN[4] AIN[0] SERCOM0/
PAD[0]
TCC0/WO[0] TCC3/
WO[2]
6 10 PA05 VDDANA EXTINT[5] AIN[5] AIN[1] SERCOM0/
PAD[1]
TCC0/WO[1] TCC3/
WO[3]
7 11 PA06 VDDANA EXTINT[6] AIN[6] AIN[2] SERCOM0/
PAD[2]
TCC1/WO[0] TCC3/
WO[4]
8 12 PA07 VDDANA EXTINT[7] AIN[7] AIN[3] SERCOM0/
PAD[3]
TCC1/WO[1] TCC3/
WO[5]
11 13 PA08 VDDIO NMI AIN[16] SERCOM0/
PAD[0]
SERCOM2/
PAD[0]
TCC0/WO[0] TCC1/
WO[2]
12 14 PA09 VDDIO EXTINT[9] AIN[17] SERCOM0/
PAD[1]
SERCOM2/
PAD[1]
TCC0/WO[1] TCC1/
WO[3]
13 15 PA10 VDDIO EXTINT[10] AIN[18] SERCOM0/
PAD[2]
SERCOM2/
PAD[2]
TCC1/WO[0] TCC0/
WO[2]
GCLK_IO[4]
14 16 PA11 VDDIO EXTINT[11] AIN[19] SERCOM0/
PAD[3]
SERCOM2/
PAD[3]
TCC1/WO[1] TCC0/
WO[3]
GCLK_IO[5]
19 PB10 VDDIO EXTINT[10] SERCOM4/
PAD[2]
TC5/WO[0] TCC0/
WO[4]
GCLK_IO[4]
20 PB11 VDDIO EXTINT[11] SERCOM4/
PAD[3]
TC5/WO[1] TCC0/
WO[5]
GCLK_IO[5]
21 PA12 VDDIO EXTINT[12] SERCOM2/
PAD[0]
SERCOM4/
PAD[0]
TCC2/WO[0] TCC0/
WO[6]
AC/CMP[0]
22 PA13 VDDIO EXTINT[13] SERCOM2/
PAD[1]
SERCOM4/
PAD[1]
TCC2/WO[1] TCC0/
WO[7]
AC/CMP[1]
SAM D21 Family
I/O Multiplexing and Considerations
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 30