(21) OC2A / PCINT31

(5) OC0B / SS / PCINT2

(22) SCL / PCINT16

(6) MOSI / PCINT13

(23) SDA / PCINT17

(7) MISO / PCINT14

(8) SCK / PCINT15

(24) TCK / PCINT18

(9) RESET

(25) TMS / PCINT19

(10) VCC

(26) TDO / PCINT20

(27) TDI / PCINT21

(28) TOSC1 / PCINT22

(29) TOSC2 / PCINT23

(30) Analog Supply Voltage

(31) GND 2nd node

(32) Analog Reference Voltage

(33) ADC7 / PCINT7

(34) ADC6 / PCINT6

(35) ADC5 / PCINT5

(36) ADC4 / PCINT4

(37) ADC3 / PCINT3

(38) ADC2 / PCINT2

(39) ADC1 / PCINT1

(40) ADC0 / PCINT0

(11) GND

(12) XTAL2

(13) XTAL1

(14) RXD0 / PCINT24

(15) TXD0 / PCINT25

(16) INT0 / PCINT26

(17) INT1 / PCINT27

(18) OC1B / PCINT28

(19) OC1A / PCINT29

(20) OC2B / ICP / PCINT30

(1) XCK0 / T0 / PCINT8

(2) CLKO / T1 / PCINT9

(3) INT2 / AIN0 / PCINT10