ATmega32U2 Atmel Corporation, ATmega32U2 Datasheet - Page 302

• Manufacturer Part Number: ATmega32U2
• Manufacturer: Atmel Corporation

Specifications of ATmega32U2

• Flash (kbytes): 32 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 20
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 1
• Eeprom (bytes): 1024
• 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: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

Table of Contents
7799D–AVR–11/10
1
2
3
4
5
6
7
8
Features ..................................................................................................... 1
Pin Configurations ................................................................................... 2
Overview ................................................................................................... 3
Resources ................................................................................................. 6
Code Examples ........................................................................................ 6
Data Retention .......................................................................................... 6
AVR CPU Core .......................................................................................... 7
AVR Memories ........................................................................................ 16
System Clock and Clock Options ......................................................... 26
1.1Disclaimer ..................................................................................................................2
2.1Block Diagram ...........................................................................................................3
2.2Pin Descriptions ........................................................................................................4
6.1Introduction ................................................................................................................7
6.2Architectural Overview ..............................................................................................7
6.3ALU – Arithmetic Logic Unit ......................................................................................8
6.4Status Register ..........................................................................................................8
6.5General Purpose Register File ................................................................................10
6.6Stack Pointer ...........................................................................................................11
6.7Instruction Execution Timing ...................................................................................12
6.8Reset and Interrupt Handling ..................................................................................13
7.1In-System Reprogrammable Flash Program Memory .............................................16
7.2SRAM Data Memory ...............................................................................................17
7.3EEPROM Data Memory ..........................................................................................18
7.4I/O Memory ..............................................................................................................19
7.5Register Description ................................................................................................20
8.1Clock Systems and their Distribution .......................................................................26
8.2Clock Switch ............................................................................................................27
8.3Clock Sources .........................................................................................................29
8.4Low Power Crystal Oscillator ...................................................................................30
8.5Full Swing Crystal Oscillator ....................................................................................32
8.6Calibrated Internal RC Oscillator .............................................................................33
8.7External Clock .........................................................................................................35
ATmega8U2/16U2/32U2
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