Figure 1-3. Pinout ATmega1281/2561
(OC0B) PG5 1
(RXD0/PCINT8/PDI) PE0 2
(TXD0/PDO) PE1 3
(XCK0/AIN0) PE2 4
(OC3A/AIN1) PE3 5
(OC3B/INT4) PE4 6
(OC3C/INT5) PE5 7
(T3/INT6) PE6 8
(ICP3/CLKO/INT7) PE7 9
(SS/PCINT0) PB0 10
(SCK/ PCINT1) PB1 11
(MOSI/ PCINT2) PB2 12
(MISO/ PCINT3) PB3 13
(OC2A/ PCINT4) PB4 14
(OC1A/PCINT5) PB5 15
(OC1B/PCINT6) PB6 16
INDEX CORNER
48 PA3 (AD3)
47 PA4 (AD4)
46 PA5 (AD5)
45 PA6 (AD6)
44 PA7 (AD7)
43 PG2 (ALE)
42 PC7 (A15)
41 PC6 (A14)
40 PC5 (A13)
39 PC4 (A12)
38 PC3 (A11)
37 PC2 (A10)
36 PC1 (A9)
35 PC0 (A8)
34 PG1 (RD)
33 PG0 (WR)
Note:
The large center pad underneath the QFN/MLF package is made of metal and internally connected to GND. It should
be soldered or glued to the board to ensure good mechanical stability. If the center pad is left unconnected, the pack-
age might loosen from the board.
ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
4
2549Q–AVR–02/2014