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AT90USB162 Datenblatt(PDF) 14 Page - ATMEL Corporation

Teilenummer AT90USB162
Bauteilbeschribung  USB DFU Bootloader
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB162 Datenblatt(HTML) 14 Page - ATMEL Corporation

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14
7618C–AVR–07/08
Important note:
The bootloader performs a watchdog reset to generate the “hardware reset” that allows to exe-
cute the application section. After a watchdog reset occurs, the AVR watchdog is still running,
thus the application should take care to disable watchdog at program start-up (otherwise the
application that does not manage the hardware watchdog will run in an infinite reset loop).
4.11
Request From Host
4.12
Answer from Bootloader
No answer is returned by the device.
5.
Security
When the USB bootloader connection is initiated, the bootloader automatically enters a
read/write software security mode (independent of the product lock bits settings). This allows to
protect the on-chip flash content from read/write access over the USB interface. Thus the only
DFU command allowed after a USB bootloader connection is a “Full Chip Erase” command.
After this “Full Chip Erase” has been received and properly executed, all DFU commands are
allowed, and thus the on-chip flash can be reprogrammed and verified.
Command Identifier
data[0]
data[1]
data[2]
data[3]
data[4]
Description
Id_write_command
04h
03h
00h
Hardware reset
01h
address
LJMP address
IN
Jump O
SETUP
DFU_UPLOAD
OUT
ZLP
SETUP
DFU_UPLOAD
ption (3 or 5 Bytes)


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