3

7766FS–AVR–11/10

ATmega16/32U4

1.

Pin Configurations

Figure 1-1.

Pinout ATmega16U4/ATmega32U4

2.

Overview

The ATmega16U4/ATmega32U4 is a low-power CMOS 8-bit microcontroller based on the AVR

enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the

ATmega16U4/ATmega32U4 achieves throughputs approaching 1 MIPS per MHz allowing the

system designer to optimize power consumption versus processing speed.

ATmega32U4

ATmega16U4

44-pin QFN/TQFP

UVcc

D-

D+

UGnd

UCap

VBus

(SS/PCINT0) PB0

(INT.6/AIN0) PE6

(PCINT1/SCLK) PB1

(PDI/PCINT2/MOSI) PB2

(PDO/PCINT3/MISO) PB3

PE2 (HWB)

PC7 (ICP3/CLK0/OC4A)

PC6 (OC3A/OC4A)

PB6 (PCINT6/OC1B/OC4B/ADC13)

PB4 (PCINT4/ADC11)

PD7 (T0/OC4D/ADC10)

PD6 (T1/OC4D/ADC9)

PD4 (ICP1/ADC8)

INDEX CORNER

1

2

3

4

5

6

7

8

9

10

11

33

32

31

30

29

28

27

26

25

24

23

PB5 (PCINT5/OC1A/OC4B/ADC12)

AVCC

GND