ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 6
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ATmega16U4
Manufacturer Part Number
ATmega16U4
Description
Manufacturer
Atmel Corporation
Specifications of ATmega16U4
Flash (kbytes)
16 Kbytes
Pin Count
44
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
14
Hardware Qtouch Acquisition
No
Max I/o Pins
26
Ext Interrupts
13
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
Sram (kbytes)
2.1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
2.7 to 5.5
Operating Voltage (vcc)
2.7 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
4
Output Compare Channels
12
Input Capture Channels
2
Pwm Channels
8
32khz Rtc
No
Calibrated Rc Oscillator
Yes
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2.2.5
2.2.6
2.2.7
2.2.8
2.2.9
2.2.10
7766F–AVR–11/10
Port D (PD7..PD0)
Port E (PE6,PE2)
Port F (PF7..PF4, PF1,PF0)
D-
D+
UGND
Only bits 6 and 7 are present on the product pinout.
Port C also serves the functions of special features of the ATmega16U4/ATmega32U4 as listed
on
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port D output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port D also serves the functions of various special features of the ATmega16U4/ATmega32U4
as listed on
Port E is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port E output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port E pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port E pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Only bits 2 and 6 are present on the product pinout.
Port E also serves the functions of various special features of the ATmega16U4/ATmega32U4
as listed on
Port F serves as analog inputs to the A/D Converter.
Port F also serves as an 8-bit bi-directional I/O port, if the A/D Converter channels are not used.
Port pins can provide internal pull-up resistors (selected for each bit). The Port F output buffers
have symmetrical drive characteristics with both high sink and source capability. As inputs, Port
F pins that are externally pulled low will source current if the pull-up resistors are activated. The
Port F pins are tri-stated when a reset condition becomes active, even if the clock is not running.
Bits 2 and 3 are not present on the product pinout.
Port F also serves the functions of the JTAG interface. If the JTAG interface is enabled, the pull-
up resistors on pins PF7(TDI), PF5(TMS), and PF4(TCK) will be activated even if a reset occurs.
USB Full speed / Low Speed Negative Data Upstream Port. Should be connected to the USB D-
connector pin with a serial 22 Ohms resistor.
USB Full speed / Low Speed Positive Data Upstream Port. Should be connected to the USB D+
connector pin with a serial 22 Ohms resistor.
USB Pads Ground.
page
75.
page
page
77.
80.
ATmega16/32U4
6
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