ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 425
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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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Manufacturer
Quantity
Price
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Table of Contents
7766F–AVR–11/10
1
2
3
4
5
6
Pin Configurations ................................................................................... 3
Overview ................................................................................................... 3
About ......................................................................................................... 8
AVR CPU Core .......................................................................................... 9
AVR ATmega16U4/ATmega32U4 Memories ........................................ 18
System Clock and Clock Options ......................................................... 27
2.1Block Diagram ...........................................................................................................4
2.2Pin Descriptions ........................................................................................................5
3.1Disclaimer ..................................................................................................................8
3.2Resources .................................................................................................................8
3.3Code Examples .........................................................................................................8
3.4Data Retention ..........................................................................................................8
4.1Introduction ................................................................................................................9
4.2Architectural Overview ..............................................................................................9
4.3ALU – Arithmetic Logic Unit ....................................................................................10
4.4Status Register ........................................................................................................11
4.5General Purpose Register File ................................................................................12
4.6Stack Pointer ...........................................................................................................13
4.7Instruction Execution Timing ...................................................................................14
4.8Reset and Interrupt Handling ..................................................................................15
5.1In-System Reprogrammable Flash Program Memory .............................................18
5.2SRAM Data Memory ...............................................................................................19
5.3EEPROM Data Memory ..........................................................................................21
5.4I/O Memory ..............................................................................................................26
6.1Clock Systems and their Distribution .......................................................................27
6.2Clock Sources .........................................................................................................28
6.3Low Power Crystal Oscillator ...................................................................................29
6.4Low Frequency Crystal Oscillator ............................................................................31
6.5Calibrated Internal RC Oscillator .............................................................................32
6.6External Clock .........................................................................................................33
6.7Clock Switch ............................................................................................................34
6.8Clock switch Algorithm ............................................................................................35
6.9Clock Output Buffer .................................................................................................37
ATmega16/32U4
i
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