Atmel ATMEGA32U4-AU TQFP-44
This is the Atmel ATmega32U4 chip used in Arduino Leonardo boards
Note: This chip DOES NOT have the Arduino Bootloader installed.
The ATmega32U4 is a low-power CMOS 8-bit microcontroller 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 allowing the system designer to optimize power consumption versus processing speed.
The ATmega32U4 provides the following features:
- 32K bytes of In-System Programmable Flash with Read-While-Write capabilities
- 1K bytes EEPROM
- 2.5K bytes SRAM
- 26 general purpose I/O lines (CMOS outputs and LVTTL inputs)
- 32 general purpose working registers
- four flexible Timer/Counters with compare modes and PWM
- one more high-speed Timer/Counter with compare modes and PLL adjustable source
- one USART (including CTS/RTS flow control signals)
- a byte oriented 2-wire Serial Interface
- a 12-channel 10-bit ADC with optional differential input stage with programmable gain
- an on-chip calibrated temperature sensor
- a programmable Watchdog Timer with Internal Oscillator
- an SPI serial port
- IEEE std. 1149.1 comp liant JTAG test interface, also used for accessing the On-chip Debug system and programming and six software selectable power saving modes.
- The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and interrupt system to continue functioning.
- The Power-down mode saves the register contents but freezes the Oscillator, disabling all other chip functions until the next interrupt or Hardware Reset.
- The ADC Noise Reduction mode stops the CPU and all I/O modules except ADC, to minimize switching noise during ADC conversions.
- In Standby mode, the Crystal/Resonator Oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low power consumption.