Graynomad:
Here's a somewhat badly formatted and unverified list of the pinsPin Port Func
0 PA8 RX0
1 PA9 TX0 15
2 PB25 Digital Pin 2
3 PC28 Digital Pin 3 15
4 PA29 and PC26 Digital Pin 4 15
5 PC25 Digital Pin 5 15
6 PC24 Digital Pin 6 15
7 PC23 Digital Pin 7 15
8 PC22 Digital Pin 8 15
9 PC21 Digital Pin 9 15
10 PA28 and PC29 Digital Pin 10 15
11 PD7 Digital Pin 11 15
12 PD8 Digital Pin 12 15
13 PB27 Digital Pin 13 / Amber LED "L"
14 PD4 TX3 15
15 PD5 RX3 15
16 PA13 TX2
17 PA12 RX2
18 PA11 TX1
19 PA10 RX1
20 PB12 SDA
21 PB13 SCL
22 PB26 Digital Pin 22
23 PA14 Digital Pin 23 15
24 PA15 Digital Pin 24 15
25 PD0 Digital Pin 25 15
26 PD1 Digital pin 26 15
27 PD2 Digital Pin 27 15
28 PD3 Digital Pin 28 15
29 PD6 Digital Pin 29 15
30 PD9 Digital Pin 30 15
31 PA7 Digital Pin 31 15
32 PD10 Digital Pin 32
33 PC1 Digital Pin 33 15
34 PC2 Digital Pin 34 15
35 PC3 Digital Pin 35 15
36 PC4 Digital Pin 36 15
37 PC5 Digital Pin 37 15
38 PC6 Digital Pin 38 15
39 PC7 Digital Pin 39 15
40 PC8 Digital Pin 40 15
41 PC9 Digital Pin 41 15
42 PA19 Digital Pin 42 15
43 PA20 Digital Pin 43
44 PC19 Digital Pin 44 15
45 PC18 Digital Pin 45 15
46 PC17 Digital Pin 46 15
47 PC16 Digital Pin 47 15
48 PC15 Digital Pin 48 15
49 PC14 Digital Pin 49 15
50 PC13 Digital Pin 50 15
51 PC12 Digital Pin 51 15
52 PB21 Digital Pin 52
53 PB14 Digital Pin 53 15
54 PA16 Analog In 0
55 PA24 Analog In 1
56 PA23 Analog In 2
57 PA22 Analog In 3
58 PA6 Analog In 4
59 PA4 Analog In 5
60 PA3 Analog In 6
61 PA2 Analog In 7
62 PB17 Analog In 8
63 PB18 Analog In 9
64 PB19 Analog In 10
65 PB20 Analog In 11
66 PB15 DAC0
67 PB16 DAC1
68 PA1 CANRX
69 PA0 CANTX 15
70 PA17 SDA1
71 PA18 SCL1 15
72 PC30 LED "RX"
73 PA21 LED "TX"
74 PA25 (MISO) 15
75 PA26 (MOSI) 15
76 PA27 (SCLK) 15
77 PA28 (NPCS0) 15
78 PB23 (unconnected) 15
USB PB11 ID 15
USB PB10 VBOF 15
The "15" indicates a high-current pin. HC pins can source 15mA and sink 9. LC pins can source 3mA and sink 6. ______ Rob
Thankyou 
di D you find it on The datasheet from atmel?