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What is ATmega16U4?

This electronic component, produced by the manufacturer "ATMEL Corporation", performs the same function as "8-bit Microcontroller".


ATmega16U4 Datasheet PDF - ATMEL Corporation

Part Number ATmega16U4
Description 8-bit Microcontroller
Manufacturers ATMEL Corporation 
Logo ATMEL Corporation Logo 


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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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ATmega16U4 equivalent
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.
The device is manufactured using the Atmel® high-density nonvolatile memory technology. The On-chip ISP
Flash allows the program memory to be reprogrammed in-system through an SPI serial interface, by a
conventional nonvolatile memory programmer, or by an On-chip Boot program running on the AVR core. The
boot program can use any interface to download the application program in the application Flash memory.
Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing
true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on
a monolithic chip, the device is a powerful microcontroller that provides a highly flexible and cost effective
solution to many embedded control applications.
The ATmega16U4/ATmega32U4 AVR is supported with a full suite of program and system development tools
including: C compilers, macro assemblers, program debugger/simulators, in-circuit emulators, and evaluation
kits.
2.2 Pin Descriptions
2.2.1 VCC
Digital supply voltage.
2.2.2 GND
Ground.
2.2.3
Port B (PB7..PB0)
Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output
buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins
that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri-
stated when a reset condition becomes active, even if the clock is not running.
Port B has better driving capabilities than the other ports.
Port B also serves the functions of various special features of the device as listed on page 74.
2.2.4
Port C (PC7,PC6)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output
buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins
that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri-
stated when a reset condition becomes active, even if the clock is not running.
Only bits 6 and 7 are present on the product pinout.
Port C also serves the functions of special features of the device as listed on page 77.
2.2.5
Port D (PD7..PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port D output
buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port D pins
that are externally pulled low will source current if the pull-up resistors are activated. The Port D pins are tri-
stated when a reset condition becomes active, even if the clock is not running.
ATmega16U4/32U4 [DATASHEET ]
Atmel-7766I-USB-ATmega16U4/32U4-Datasheet_072015
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ATMEGA16U4 datasheet


1. - 8-bit, AVR Microcontroller

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