DM160232 Serial Memory Single-Wire Evaluation Kit User’s Guide
2018 Microchip Technology Inc.
DS20005939A-page 37
Once the USB Base Board is plugged in and recognized by the PC, the user should
enable DFU mode on the USB Base Board. DFU mode is enabled by a specific
sequence of
HWB
and
RESET
HWB
and
RESET
buttons.
FIGURE 4-11:
USB BASE BOARD BUTTONS
Once the
HWB
and
RESET
buttons have been located, use the specific press and hold
sequence shown below to enable DFU mode on the USB Base Board.
• Press and hold the
HWB
button
• Press and release
the
RESET
button
• Release
the
HWB
button
Once the USB Base Board has DFU mode enabled, allow the PC to relearn the USB
Base Board as “AT90USB128 DFU” (
). If the PC does not automatically
recognize the USB Base Board as stated above and shown below, it is recommended
to unplug the USB Base Board from the PC and restart the procedure.
FIGURE 4-12:
AT90USB128 DFU COM PORT
Note:
Once DFU mode is enabled on the USB Base Board, the rest of the
firmware upgrade process must be completed in order to ensure robust
USB Base Board operation.
HWB button
RESET button