ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 4

• 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

2.1
Figure 2-1.
7766F–AVR–11/10
AREF
AVCC
AGND
GND
VCC
Block Diagram
ON-CHIP DEBUG
PROGRAMMING
Block Diagram
BOUNDARY-
JTAG TAP
LOGIC
SCAN
DATA REGISTER
DATA REGISTER
TEMPERATURE
COMPARATOR
SENSOR
PORTE
ANALOG
PORTF
PF7 - PF4
PE6
ADC
The AVR core combines a rich instruction set with 32 general purpose working registers. All the
32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent
registers to be accessed in one single instruction executed in one clock cycle. The resulting
architecture is more code efficient while achieving throughputs up to ten times faster than con-
ventional CISC microcontrollers.
The ATmega16U4/ATmega32U4 provides the following features: 16/32K bytes of In-System
Programmable Flash with Read-While-Write capabilities, 512Bytes/1K bytes EEPROM,
1.25/2.5K 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-
PORTF DRIVERS
PORTE DRIVERS
INSTRUCTION
INSTRUCTION
PROGRAM
PROGRAM
REGISTER
COUNTER
CONTROL
DECODER
FLASH
LINES
PE2
REG. PORTE
REG. PORTF
DATA DIR.
DATA DIR.
PF1 PF0
USART1
DATA REGISTER
REGISTERS
POR - BOD
REGISTER
PURPOSE
GENERAL
POINTER
STATUS
STACK
RESET
SRAM
PORTB
ALU
X
Y
Z
PORTB DRIVERS
PB7 - PB0
REG. PORTB
DATA DIR.
MCU CONTROL
HIGH SPEED
OSCILLATOR
TIMER/PWM
INTERRUPT
WATCHDOG
COUNTERS
REGISTER
INTERNAL
EEPROM
TIMERS/
TIMER
UNIT
SPI
8-BIT DA TA BUS
DATA REGISTER
PORTD
DATA REGISTER
PORTD DRIVERS
PC7
PD7 - PD0
PORTC
PC6
OSCILLATOR
TIMING AND
CALIB. OSC
CONTROL
USB 2.0
PORTC DRIVERS
PLL
REG. PORTD
DATA DIR.
REG. PORTC
TWO-WIRE SERIAL
DATA DIR.
INTERFACE
ATmega16/32U4
REGULATOR
USB PAD 3V
ON-CHIP
UCap
UVcc
VBUS
DP
DM
1uF
4