====== ATSAMC21 pinout ======

{{ :arm:atsamc21:atsamc21-pinout.xlsx |Sortable excel sheet}}
===== C21E 32-pin package =====

<sortable>
^ PIN		^ I/O	^ SUPPLY	^ XTAL		^ EIC			^ REF			^ ADC0		^ ADC1		^ AC		^ PTC			^ DAC	^ SDADC		^ SERCOM			^ SERCOM-ALT		^ TC/TCC		^ TCC			^ COM				^ AC/GCLK		^ CCL			^
^ IOMUX:					  			 ^^^^ A													 ^^^^ B											 ^^^^ C					^ D					^ E				^ F				^ G					^ H				^ I				^
|  1		| PA00	| VDDANA 	| XOSC32K	| EXTINT[0]		| 				| 			|			|			|				|		|			|					| SERCOM1/PAD[0]	| TCC2/WO[0]	|				|					| CMP[2]		|				|
|  2		| PA01	| VDDANA 	| XOSC32K	| EXTINT[1]		| 				| 			|			|			|				|		|			|					| SERCOM1/PAD[1]	| TCC2/WO[1]	|				|					| CMP[3]		|				|
|  3		| PA02	| VDDANA 	|			| EXTINT[2]		| 				| AIN[0]	|			| AIN[4]	| Y[0]			| VOUT  |       	|             		|                   |               |       		|       			|         		|				|
|  4		| PA03	| VDDANA 	|			| EXTINT[3]		| ADC-DAC/VREFA	| AIN[1]	|			| AIN[5]	| Y[1]          |	    |       	|             		|                   |               |       		|       			|         		|				|
|  5		| PA04	| VDDANA 	|			| EXTINT[4]		| SDADC / VREFB	| AIN[4]	|			| AIN[0]	| Y[2] 			|		| 			|					| SERCOM0/PAD[0]	| TCC0/WO[0]	| CCL0/IN[0]	|       			|               |		        |
|  6		| PA05	| VDDANA 	|			| EXTINT[5]		| 				| AIN[5]	|			| AIN[1]	| Y[3] 			|		| 			|					| SERCOM0/PAD[1]	| TCC0/WO[1]	| CCL0/IN[1]	|       			|               |		        |
|  7		| PA06	| VDDANA 	|			| EXTINT[6]		| 				| AIN[6]	|			| AIN[2]	| Y[4] 			|		| AINN[0]	| 					| SERCOM0/PAD[2]	| TCC1/WO[0]	| CCL0/IN[2]	|       			|               |		        |
|  8		| PA07	| VDDANA 	|			| EXTINT[7]		| 				| AIN[7]	|			| AIN[3]	| Y[5] 			|		| AINP[0]	| 					| SERCOM0/PAD[3]	| TCC1/WO[1]	| CCL0/OUT[0]	|       			|               |		        |
| 11		| PA08	| VDDIO  	|			| NMI 			|				| AIN[8]	| AIN[10]	|			| X[0]/Y[16] 	|		|			| SERCOM0/PAD[0] 	| SERCOM2/PAD[0]	| TCC0/WO[0]	| TCC1/WO[2]	|					| CCL1/IN[3]	|		        |
| 12		| PA09	| VDDIO  	|			| EXTINT[9]		| 				| AIN[9]	| AIN[11]	|			| X[1]/Y[17]	|		|			| SERCOM0/PAD[1] 	| SERCOM2/PAD[1]	| TCC0/WO[1]	| TCC1/WO[3]	|					| CCL1/IN[4]	|		        |
| 13		| PA10	| VDDIO  	|			| EXTINT[10]	| 				| AIN[10]	|			|			| X[2]/Y[18] 	|		|			| SERCOM0/PAD[2] 	| SERCOM2/PAD[2]	| TCC1/WO[0]	| TCC0/WO[2]	|					| GCLK_IO[4]	| CCL1/IN[5]    |
| 14		| PA11	| VDDIO  	|			| EXTINT[11] 	| 				| AIN[11]	|			|			| X[3]/Y[19] 	|		|			| SERCOM0/PAD[3] 	| SERCOM2/PAD[3]	| TCC1/WO[1]	| TCC0/WO[3]	|					| GCLK_IO[5]	| CCL1/OUT[1]   |
| 15		| PA14	| VDDIO  	| XOSC		| EXTINT[14]	| 				|			|			|			| 				|		|			| SERCOM2/PAD[2] 	| 					| TC4/WO[0] 	| TCC0/WO[4] 	|					| GCLK_IO[0]	|               |
| 16		| PA15	| VDDIO  	| XOSC		| EXTINT[15]	| 				|			|			|			| 				|		|			| SERCOM2/PAD[3] 	| 					| TC4/WO[1] 	| TCC0/WO[5] 	|					| GCLK_IO[1]	|               |
| 17		| PA16	| VDDIO  	|			| EXTINT[0] 	| 				|			|			|			| X[4]/Y[20]	|		|			| SERCOM1/PAD[0] 	| SERCOM3/PAD[0]	| TCC2/WO[0] 	| TCC0/WO[6] 	|					| GCLK_IO[2]	| CCL0/IN[0]    |
| 18		| PA17	| VDDIO  	|			| EXTINT[1] 	| 				|			|			|			| X[5]/Y[21]	|		|			| SERCOM1/PAD[1] 	| SERCOM3/PAD[1]	| TCC2/WO[1] 	| TCC0/WO[7] 	|					| GCLK_IO[3]	| CCL0/IN[1]    |
| 19		| PA18	| VDDIO  	|			| EXTINT[2] 	| 				|			|			|			| X[6]/Y[22]	|		|			| SERCOM1/PAD[2] 	| SERCOM3/PAD[2]	| TC4/WO[0] 	| TCC0/WO[2] 	| 					| AC/CMP[0] 	| CCL0/IN[2]    |
| 20		| PA19	| VDDIO  	|			| EXTINT[3] 	| 				|			|			|			| X[7]/Y[23]	|		|			| SERCOM1/PAD[3] 	| SERCOM3/PAD[3]	| TC4/WO[1] 	| TCC0/WO[3] 	| 					| AC/CMP[1] 	| CCL0/OUT[0]   |
| 21		| PA22	| VDDIO  	|			| EXTINT[6] 	| 				|			|			|			| X[10]/Y[26]	|		|			| SERCOM3/PAD[0] 	| 					| TC0/WO[0] 	| TCC0/WO[4] 	| 					| GCLK_IO[6] 	| CCL2/IN[6]    |
| 22		| PA23	| VDDIO  	|			| EXTINT[7] 	| 				|			|			|			| X[11]/Y[27]	|		|			| SERCOM3/PAD[1] 	| 					| TC0/WO[1] 	| TCC0/WO[5] 	| 					| GCLK_IO[7] 	| CCL2/IN[7]    |
| 23		| PA24	| VDDIO  	|			| EXTINT[12] 	| 				|			|			|			|				|		|			| SERCOM3/PAD[2] 	| 					| TC1/WO[0] 	| TCC1/WO[2] 	| CAN0/TX			| AC/CMP[2] 	| CCL2/IN[8]    |
| 24		| PA25	| VDDIO  	|			| EXTINT[13] 	| 				|			|			|			|				|		|			| SERCOM3/PAD[3] 	| 					| TC1/WO[1] 	| TCC1/WO[3] 	| CAN0/RX			| AC/CMP[3] 	| CCL2/OUT[2]   |
| 25		| PA27	| VDDIN  	|			| EXTINT[15] 	|				|			|			|			|				|		|			|					|					| 				| GCLK_IO[0]    |					|               |               |
| 27		| PA28	| VDDIN  	|			| EXTINT[8] 	|				|			|			|			|				|		|			|					|					| 				| GCLK_IO[0]    |					|               |               |
| 31		| PA30	| VDDIN  	|			| EXTINT[10] 	| 				|			|			|			|				|		| 			|					| SERCOM1/PAD[2]	| TCC1/WO[0] 	|				| CORTEX_M0P/SWCLK	| GCLK_IO[0] 	| CCL1/IN[3]    |
| 32		| PA31	| VDDIN  	|			| EXTINT[11] 	| 				|			|			|			|				|		| 			|					| SERCOM1/PAD[3]	| TCC1/WO[1] 	|				| CORTEX_M0P/SWDIO	| CCL1/OUT[1]   |               |
</sortable>