ATmega16U4 Datasheet PDF - ATMEL

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ATmega16U4
ATMEL

Part Number ATmega16U4
Description 8-bit Microcontroller
Page 30 Pages


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ATmega16U4/ATmega32U4
8-bit Microcontroller with 16/32K bytes of ISP Flash and
USB Controller
DATASHEET
Features
High Performance, Low Power AVR® 8-Bit Microcontroller
Advanced RISC Architecture
– 135 Powerful Instructions – Most Single Clock Cycle Execution
– 32 x 8 General Purpose Working Registers
– Fully Static Operation
– Up to 16 MIPS Throughput at 16MHz
– On-Chip 2-cycle Multiplier
Non-volatile Program and Data Memories
– 16/32KB of In-System Self-Programmable Flash
– 1.25/2.5KB Internal SRAM
– 512Bytes/1KB Internal EEPROM
– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM
– Data retention: 20 years at 85C/ 100 years at 25C(1)
– Optional Boot Code Section with Independent Lock Bits
In-System Programming by On-chip Boot Program
True Read-While-Write Operation
Parts using external XTAL clock are pre-programed with a default USB bootloader
– Programming Lock for Software Security
JTAG (IEEE® std. 1149.1 compliant) Interface
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support
– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface
USB 2.0 Full-speed/Low Speed Device Module with Interrupt on Transfer Completion
– Complies fully with Universal Serial Bus Specification Rev 2.0
– Supports data transfer rates up to 12Mbit/s and 1.5Mbit/s
– Endpoint 0 for Control Transfers: up to 64-bytes
– Six Programmable Endpoints with IN or Out Directions and with Bulk, Interrupt or
Isochronous Transfers
– Configurable Endpoints size up to 256 bytes in double bank mode
– Fully independent 832 bytes USB DPRAM for endpoint memory allocation
– Suspend/Resume Interrupts
– CPU Reset possible on USB Bus Reset detection
– 48MHz from PLL for Full-speed Bus Operation
– USB Bus Connection/Disconnection on Microcontroller Request
– Crystal-less operation for Low Speed mode
Peripheral Features
– On-chip PLL for USB and High Speed Timer: 32 up to 96MHz operation
– One 8-bit Timer/Counter with Separate Prescaler and Compare Mode
Atmel-7766I-USB-ATmega16U4/32U4-Datasheet_072015



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– Two 16-bit Timer/Counter with Separate Prescaler, Compare- and Capture Mode
– One 10-bit High-Speed Timer/Counter with PLL (64MHz) and Compare Mode
– Four 8-bit PWM Channels
– Four PWM Channels with Programmable Resolution from 2 to 16 Bits
– Six PWM Channels for High Speed Operation, with Programmable Resolution from 2 to 11 Bits
– Output Compare Modulator
– 12-channels, 10-bit ADC (features Differential Channels with Programmable Gain)
– Programmable Serial USART with Hardware Flow Control
– Master/Slave SPI Serial Interface
– Byte Oriented 2-wire Serial Interface
– Programmable Watchdog Timer with Separate On-chip Oscillator
– On-chip Analog Comparator
– Interrupt and Wake-up on Pin Change
– On-chip Temperature Sensor
Special Microcontroller Features
– Power-on Reset and Programmable Brown-out Detection
– Internal 8MHz Calibrated Oscillator
– Internal clock prescaler and On-the-fly Clock Switching (Int RC / Ext Osc)
– External and Internal Interrupt Sources
– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
I/O and Packages
– All I/O combine CMOS outputs and LVTTL inputs
– 26 Programmable I/O Lines
– 44-lead TQFP Package, 10x10mm
– 44-lead QFN Package, 7x7mm
Operating Voltages
– 2.7 - 5.5V
Operating temperature
– Industrial (-40°C to +85°C)
Maximum Frequency
– 8MHz at 2.7V - Industrial range
– 16MHz at 4.5V - Industrial range
Note: 1. See “Data Retention” on page 8 for details.
2 ATmega16U4/32U4 [DATASHEET]
Atmel-7766I-USB-ATmega16U4/32U4-Datasheet_072015



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1. Pin Configurations
Figure 1-1. Pinout
(INT.6/AIN0) PE6
UVcc
1
2
D- 3
D+ 4
UGnd 5
UCap 6
VBus 7
(SS/PCINT0) PB0 8
(PCINT1/SCL)KPB1
9
(PDI/PCINT2/MOSI) PB2 10
(PDO/PCINT3/MIS)OPB3 11
INDEX CORNER
ATmega32U4
ATmega16U4
44-pin QFN/QT FP
33 PE2 (HWB)
32 PC7 (ICP3/CLK0/OC)4A
31 PC6 O( C3A/OC4A)
30 PB6 (PCINT6/OC1B/OC4B/ADC
29 PB5 (PCINT5/OC1A/OC4B/ADC
28 PB4 (PCINT4/ADC11)
27 PD7 (T0/OC4D/ADC10)
26 PD6 (T1/OC4D/ADC9)
25 PD4 (ICP1/ADC8)
24 AVCC
23 GND
2. Overview
The ATmega16U4/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 device achieves throughputs
approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing
speed.
ATmega16U4/32U4 [DATASHEET ]
Atmel-7766I-USB-ATmega16U4/32U4-Datasheet_072015
3



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2.1 Block Diagram
Figure 2-1. Block Diagram
PF7 - PF4
PF1 PF0
VCC
GND
PORTF DRIVERS
DATA REGISTER
PORTF
DATA DIR.
REG. PORTF
POR - BOD
RESET
AVCC
AGND
AREF
JTAG TAP
PROGRAM
COUNTER
STACK
POINTER
ON-CHIP DEBUG
PROGRAM
FLASH
BOUNDARY-
SCAN
INSTRUCTION
REGISTER
PROGRAMMING
LOGIC
INSTRUCTION
DECODER
TEMPERATURE
SENSOR
CONTROL
LINES
ADC
SRAM
GENERAL
PURPOSE
REGISTERS
X
Y
Z
ALU
STATUS
REGISTER
ANALOG
COMPARATOR
USART1
PC7 PC6
PORTC DRIVERS
DATA REGISTER
PORTC
8-BIT DA TA BUS
DATA DIR.
REG. PORTC
INTERNAL
OSCILLATOR
WATCHDOG
TIMER
MCU CONTROL
REGISTER
TIMERS/
COUNTERS
INTERRUPT
UNIT
EEPROM
HIGH SPEED
TIMER/PWM
SPI
CALIB. OSC
OSCILLATOR
TIMING AND
CONTROL
ON-CHIP
USB PAD 3V
REGULATOR
PLL
USB 2.0
TWO-WIRE SERIAL
INTERFACE
UVcc
UCap
1uF
VBUS
DP
DM
DATA REGISTER
PORTE
DATA DIR.
REG. PORTE
DATA REGISTER
PORTB
DATA DIR.
REG. PORTB
DATA REGISTER
PORTD
DATA DIR.
REG. PORTD
PORTE DRIVERS
PORTB DRIVERS
PORTD DRIVERS
PE6
PE2
PB7 - PB0
PD7 - PD0
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 conventional CISC microcontrollers.
The device 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-channels 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 compliant JTAG
test interface, also used for accessing the On-chip Debug system and programming and six software selectable
4 ATmega16U4/32U4 [DATASHEET]
Atmel-7766I-USB-ATmega16U4/32U4-Datasheet_072015



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