ATmega8U2 Atmel Corporation, ATmega8U2 Datasheet - Page 11

• Manufacturer Part Number: ATmega8U2
• Manufacturer: Atmel Corporation

Specifications of ATmega8U2

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 22
• Ext Interrupts: 20
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 512
• 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: 2
• Output Compare Channels: 5
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

4.7.1
4.7.2
4.7.3
7618C–AVR–07/08
First Request from Host
Second Request from Host
Answers from the Device
The Host sends a DFU Download request with a Display command in the data field.
The Host sends a DFU Upload request.
The device sends to the Host the firmware from the specified start address to the specified end
address.
Command Identifier
Id_display_data
OUT
SETUP
IN
IN
IN
03h
data[0]
SETUP
OUT
IN
00h
01h
02h
ZLP
DFU_UPLOAD
Firmware Packet 1
Firmware Packet 2
Firmware Packet n
data[1]
start_address
data[2]
DFU_DNLOAD
Display_Data (6 bytes)
ZLP
data[3]
end_address
data[4]
Display EEPROM Data
Blank Check in FLASH
Display FLASH Data
Description
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