ATmega16U4/ATmega32U4
1. Pin Configurations
Figure 1-1. Pinout ATmega16U4/ATmega32U4
PE2 (HWB)
33
32
31
30
29
28
27
26
25
24
23
1
2
3
4
5
6
7
8
9
(INT.6/AIN0) PE6
UVcc
PC7 (ICP3/CLK0/OC4A)
PC6 (OC3A/OC4A)
PB6 (PCINT6/OC1B/OC4B/ADC13)
PB5 (PCINT5/OC1A/OC4B/ADC12)
PB4 (PCINT4/ADC11)
PD7 (T0/OC4D/ADC10)
PD6 (T1/OC4D/ADC9)
PD4 (ICP1/ADC8)
INDEX CORNER
D-
D+
UGnd
UCap
VBus
ATmega32U4
ATmega16U4
44-pin QFN/TQFP
(SS/PCINT0) PB0
(PCINT1/SCLK) PB1
AVCC
(PDI/PCINT2/MOSI) PB2 10
(PDO/PCINT3/MISO) PB3 11
GND
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.
3
7766ES–AVR–04/10
ATMEL [ ATMEL ]
