ATmega16U4/ATmega32U4
1. Pin Configurations
Figure 1-1.
Pinout ATmega16U4/ATmega32U4
PF5 (ADC5/TMS)
PF6 (ADC6/TDO)
PF4 (ADC4/TCK)
PF7 (ADC7/TDI)
PF0 (ADC0)
PF1 (ADC1)
AVCC
AREF
GND
GND
35
44
43
42
41
40
39
38
37
36
34
VCC
(INT.6/AIN0) PE6
UVcc
D-
D+
UGnd
UCap
VBus
(SS/PCINT0) PB0
(PCINT1/SCLK) PB1
(PDI/PCINT2/MOSI) PB2
(PDO/PCINT3/MISO) PB3
1
2
INDEX CORNER
33 PE2 (HWB)
32 PC7 (ICP3/CLK0/OC4A)
31 PC6 (OC3A/OC4A)
30 PB6 (PCINT6/OC1B/OC4B/ADC13)
29
PB5 (PCINT5/OC1A/OC4B/ADC12)
3
4
5
6
7
8
9
10
11
12
13
VCC 14
GND 15
XTAL2 16
XTAL1 17
18
19
20
21
22
(XCK1/CTS) PD5
ATmega32U4
ATmega16U4
44-pin QFN/TQFP
28 PB4 (PCINT4/ADC11)
27 PD7 (T0/OC4D/ADC10)
26 PD6 (T1/OC4D/ADC9)
25 PD4 (ICP1/ADC8)
24 AVCC
23 GND
(SDA/INT1) PD1
(OC0B/SCL/INT0) PD0
(RXD1/INT2) PD2
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.
(PCINT7/OC0A/OC1C/RTS) PB7
(TXD1/INT3) PD3
RESET
3
7766DS–AVR–01/09
ATMEL [ ATMEL CORPORATION ]
