Datenblatt-Suchmaschine für elektronische Bauteile |
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AT90USB162 Datenblatt(PDF) 14 Page - ATMEL Corporation |
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AT90USB162 Datenblatt(HTML) 14 Page - ATMEL Corporation |
14 / 28 page 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) |
Ähnliche Teilenummer - AT90USB162 |
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Ähnliche Beschreibung - AT90USB162 |
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