atmega32u4-16mu ATMEL Corporation, atmega32u4-16mu Datasheet - Page 424

• Manufacturer Part Number: atmega32u4-16mu
• Description: Atmega32u4 8-bit Avr Microcontroller With 32k Bytes Of Isp Flash And Usb Controller
• Manufacturer: ATMEL Corporation

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Pin Configurations ................................................................................... 3
Overview ................................................................................................... 3
About Code Examples ............................................................................. 7
AVR CPU Core .......................................................................................... 8
AVR ATmega32U4 Memories ................................................................ 17
System Clock and Clock Options ......................................................... 26
Power Management and Sleep Modes ................................................. 41
1.1 Disclaimer .................................................................................................................3
2.1 Block Diagram ..........................................................................................................4
2.2 Pin Descriptions ........................................................................................................5
4.1 Introduction ...............................................................................................................8
4.2 Architectural Overview ..............................................................................................8
4.3 ALU – Arithmetic Logic Unit ......................................................................................9
4.4 Status Register .......................................................................................................10
4.5 General Purpose Register File ...............................................................................11
4.6 Stack Pointer ..........................................................................................................12
4.7 Instruction Execution Timing ..................................................................................13
4.8 Reset and Interrupt Handling ..................................................................................14
5.1 In-System Reprogrammable Flash Program Memory ............................................17
5.2 SRAM Data Memory ...............................................................................................18
5.3 EEPROM Data Memory .........................................................................................20
5.4 I/O Memory .............................................................................................................25
6.1 Clock Systems and their Distribution ......................................................................26
6.2 Clock Sources ........................................................................................................27
6.3 Low Power Crystal Oscillator ..................................................................................28
6.4 Low Frequency Crystal Oscillator ...........................................................................30
6.5 Calibrated Internal RC Oscillator ............................................................................31
6.6 External Clock ........................................................................................................32
6.7 Clock Output Buffer ................................................................................................36
6.8 System Clock Prescaler .........................................................................................36
6.9 PLL .........................................................................................................................38
7.1 Idle Mode ................................................................................................................42
7.2 ADC Noise Reduction Mode ...................................................................................42
7.3 Power-down Mode ..................................................................................................42
ATmega32U4
7766A–AVR–03/08