2.3 Pinout and Multiplexing


Package/Pin Number					Pin Name	Special	A	B				C	D	E	F	G	H	I	P
VQFN TQFP		SSOP SPDIP	VQFN	SOIC			EXTINT	ADC0		PTC	ACn	SERCOMn		TCn	TCC0	SWCLK	CCLn, ACn OUT	GCLKn	PTC
32-pin	28-pin	28-pin	20-pin	20-pin			EXTINT	Pos	Neg	EXTCINT	ACn	SERCOMn		TCn	TCC0	SWCLK	CCLn, ACn OUT	GCLKn	X/Y
30	26	22	17	4	PA00	XTAL32K1⁽⁵⁾	EXTINT[0]					0,PAD[0]⁽²⁾	1,PAD[0]	0,WO0	WO0		0,IN0	1,IO
31	27	23	18	5	PA01	XTAL32K2⁽⁵⁾	NMI					0,PAD[1]⁽²⁾	1,PAD[1]	0,WO1	WO1		0,IN1	2,IO
32	28	24	19	6	PA02		EXTINT[2]	AINP2	AINN2			0,PAD[2]	1,PAD[2]	1,WO0	WO2		0,IN2	3,IO	X2/Y2
1	1	25	20	7	PA03		EXTINT[3]	AINP3	AINN3			0,PAD[3]	1,PAD[3]	1,WO1	WO3		0,OUT	0,IO	X3/Y3
2	2	26	1	8	PA04		EXTINT[4]	AINP4	AINN4			0,PAD[0]⁽²⁾						1,IO	X4/Y4
3	3	27	2	9	PA05		EXTINT[5]	AINP5	AINN5			0,PAD[1]⁽²⁾					AC1⁽⁴⁾	2,IO	X5/Y5
4	4	28	3	10	PA06		EXTINT[6]	AINP6	AINN6			0,PAD[2]					0,OUT	3, IO	X6/Y6
5	5	1	4	11	PA07		NMI	AINP7	AINN7			0,PAD[3]					AC0⁽⁴⁾	0,IO	X7/Y7
6	6	2			PA08	VDDIO2⁽³⁾	EXTINT[8]					1,PAD[2]	0,PAD[2]	1,WO0	WO0		1,IN0	1.IO
7	7	3	5	12	PA09	VDDIO2⁽³⁾	EXTINT[9]					1,PAD[3]	0,PAD[3]	1,WO1	WO1		1,IN1	2,IO
8	8	4	6	13	PA10	VDDIO2⁽³⁾	EXTINT[10]					1,PAD[0]	0,PAD[0]⁽²⁾	0,WO0	WO2		1,IN2	3,IO
9	9	5	7	14	PA11	VDDIO2⁽³⁾	EXTINT[11]					1,PAD[1]	0,PAD[1]⁽²⁾	0,WO1	WO3		1,OUT	1,IO
10	10	6	8	15	VDDIO2
11	11	7			PA17		EXTINT[1]	AINP17	AINN17						WO1		2,IN1		X17/Y17
12	12	8			PA18		EXTINT[2]	AINP18	AINN18		0,P0 1,P0				WO2		2,IN2		X18/Y18
13	13	9			PA19		EXTINT[3]	AINP19	AINN19		0,N0 1,P1				WO3		2,OUT		X19/Y19
14	14	10	9	16	PA20	SWDIO	EXTINT[4]	AINP20	AINN20		0,P5 1,P2	1,PAD[0]		2,WO0				2,IO	X20/Y20
15	15	11	10	17	PA21		EXTINT[5]	AINP21	AINN21	EXTCINT0	0,P6 1,N0/P5	1,PAD[1]		2,WO1				3,IO	X21/Y21
16	16	12	11	18	PA22		EXTINT[6]	AINP22	AINN22	EXTCINT1	0,P3 1,P3	1,PAD[2]					2,OUT	1, IO	X22/Y22
17	17	13	12	19	PA23	VREFA	EXTINT[7]	AINP23	AINN23		0,N2 1,N2	1,PAD[3]						0,IO	X23/Y23
18	18	14	13	20	AVDD
19	19	15	14	1	AGND
20	20	16			PA24	XTAL32K1	EXTINT[8]	AINP24	AINN24				1,PAD[2]		WO0		3,IN0	1,IO	X24/Y24
21	21	17			PA25	XTAL32K2	EXTINT[9]	AINP25	AINN25				1,PAD[3]		WO1		3,IN1	2,IO	X25/Y25
22					PA26		EXTINT[10]	AINP26	AINN26				1,PAD[0]		WO2		3, IN2	3,IO	X26/Y26
23					PA27		EXTINT[11]	AINP27	AINN27				1,PAD[1]		WO3		3,OUT		X27/Y27
24					PA28		EXTINT[12]	AINP28	AINN28										X28/Y28
25					PA29		EXTINT[13]	AINP29	AINN29										X29/Y29
26	22	18	15	2	PA30	RESET	NMI
27	23	19	16	3	PA31	SWCLK	EXTINT[15]	AINP31	AINN31			1,PAD[0]	0,PAD[2]			SWCLK		0,IO	X31/Y31
28	24	20			VDD
29	25	21			GND

To select pin positions, refer to the PORT chapter.
This pin supports I²C with SERCOM0.
This pin is on the VDDIO2 power domain. For usage and properties, refer to the MVIO description in the SUPC - Supply Controller and the Electrical Characteristics sections.
The output of the Analog Comparator to the pin can be used as an input to the CCL. Refer also to the CCL - Configurable Custom Logic section.
For 20-pin packages only.