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AT90USB162 Datasheet(PDF) 2 Page - ATMEL Corporation

No. de pieza AT90USB162
Descripción Electrónicos  USB DFU Bootloader
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB162 Datasheet(HTML) 2 Page - ATMEL Corporation

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2
7618C–AVR–07/08
2.
Bootloader Environment
The bootloader is located in the boot section of the on-chip Flash memory, it manages the USB
communication protocol and performs read/write operations to the on-chip memories
(Flash/EEPROM).
The USB bootloader is loaded in the “Bootloader Flash Section” of the on-chip Flash memory.
The size of the bootloader flash section must be larger than the bootloader size.USB products
are factory configured with the default on-chip USB bootloader and the required bootsection
configuration.
Table 2-1.
USB Bootloader Parameters
Figure 2-1.
Physical Environment
3.
Bootloader Activation
As specified in the AT90USB datasheet, the bootloader can be activated by one of the following
conditions:
• Regular application execution: A jump or call from the user application program. This may
be initiated by a trigger such as a command received via USB, USART or SPI and decoded
by the application.
Product
Flash Bootsection Size
Configuration
VID / PID
Bootloader Start Address
(word address)
AT90USB1287
4 KWord
0x03EB / 0x2FFB
0xf000
AT90USB1286
AT90USB647
2 KWord
0x03EB / 0x2FF9
0x7800
AT90USB646
AT90USB162
0x03EB / 0x2FFA
0x1800
AT90USB82
0x03EB / 0x2FF7
0x0800
ATmega32U4
0x03EB / 0x2FF4
0x3800
ATmega16U4
0x03EB / 0x2FF3
0x0800
USB Bootloader
in Boot section
Flash
Application section
Read/Write
USB
Interface
EEPROM Data
Read/Write
DFU Class


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