Datasheet Microchip ATMEGA16U4-AU

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 85C/ 100 years at 25C(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 …

ATmega16U4/ATmega32U4
8-bit Microcontroller with 16/32K bytes of ISP Flash and
USB Controller
DATASHEET SUMMARY
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 85C/ 100 years at 25C(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 (IEEEВ® std. 1149.1 compliant) Interface
– Boundary-scan Capabilities According to the JTAG Standard
– Extensive On-chip Debug Support …

Features USB Protocol
– Based on the USB DFU class
– Autobaud (8/16 MHz crystal) In-System Programming
– Read/Write Flash and EEPROM on-chip memories
– Read Device ID
– Full chip Erase
– Start application command In-Application Programming
– Software Entry-points for on-chip flash drivers 1. Description
The 8bits mega AVR with USB interface devices are factory configured with a
USB bootloader located in the on-chip flash boot section of the controller.
This USB bootloader allows to perform In-System Programming from an USB
host controller without removing the part from the system or without a
pre-programmed application, and without any external programming interface.
This document describes the USB bootloader functionalities as well as the serial
protocol to efficiently perform operations on the on chip Flash memories (Flash
and EEPROM). USB DFU
Bootloader
Datasheet
AT90USB128x
AT90USB64x
AT90USB162
AT90USB82
ATmega32U4 …