The Atmel ATmega32U4 Microcontroller is an 8-bit megaAVR device based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle the ATmega32U4 achieves throughputs approaching 1 MIPS per MHz, balancing power consumption and speed.

The ATmega32U4 features a USB 2.0 Device Module making it an ideal candidate for applications requiring USB connectivity. Also integrated is a JTAG interface for on-chip debug.

16 MHz Max. Operating Frequency
Up to 16 MIPS at 16 MHz
32 KB Flash
1024 B EEPROM
2.5 KB SRAM
135 Instructions – Most single clock cycle execution
32 General Purpose Registers
26 GPIO
Power-on Reset and Programmable Brown-out Detection
Internal 8 MHz Calibrated Oscillator
Internal Clock Prescaler and On-the-fly Clock Switching
External and Internal Interrupt Sources
Six Power-Saving Sleep Modes
Internal and External Interrupts
Fully Static Operation
On-Chip 2-cycle Multiplier

USB 2.0 Full-speed/Low Speed Device Module
JTAG (IEEE1149.1 compliant) Interface
Programmable Serial USART with Hardware Flow Control
Master/Slave SPI Serial Interface
Byte Oriented 2-wire Serial Interface

On-chip PLL for USB and High-Speed Timer
10-bit Analogue-to-Digital Converter (ADC) – 12 Channel
One 10-bit High-Speed Timer/Counter with PLL (64 MHz) and Compare Mode
One 8-bit Timer/Counter with Separate Prescaler and Compare Mode
Two 16-bit Timers/Counters with Separate Prescaler, Compare and Capture Mode
Four 8-bit PWM Channels
Four PWM Channels with Programmable Resolution from 2 bits to 16 bits
Six PWM Channels for High-Speed Operation, with Programmable Resolution from 2 bits to 11 bits
Output Compare Modulator
Programmable Watchdog Timer with Separate On-chip Oscillator
On-chip Analogue Comparator
Interrupt and Wake-up on Pin Change
On-chip Temperature Sensor