ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 425

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 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): 3.3
• 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: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

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
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