AT89C51SND1_06 ATMEL [ATMEL Corporation], AT89C51SND1_06 Datasheet - Page 14

• Manufacturer Part Number: AT89C51SND1_06
• Description: USB Microcontrollers
• Manufacturer: ATMEL [ATMEL Corporation]

DFU Functional
Descriptor
Command Description This protocol allows to:
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AT89C51SND1
Table 12. DFU Functional Descriptor
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Overview of the protocol is detailed in Appendix-A.
Offset
Initiate the communication
Program the Flash Data
Read the Flash Data
Program Configuration Information
Read Configuration and Manufacturer Information
Erase the Flash
Start the application
0
1
2
3
5
Field
bLength
bDescriptorType
bmAttributes
wDetachTimeOut
wTransferSize
possible uses of alternate settings are beyond the scope of this document. However, their use
is intentionally not restricted because it is anticipated that implementers will devise additional
creative uses for alternate settings.
Size
1
1
1
2
2
Bit mask
Number
Number
Value
07h
21h
Description
Size of this descriptor, in bytes
DFU FUNCTIONAL descriptor type
DFU Attributes:
bit 7:3: reserved
bit 2: device is able to communicate via USB after
Manifestation phase
1 = yes, 0 = no, must see bus reset
bit 1: bitCanUpload: upload capable 1 = yes, 0 = no
bit 0: bitCanDnload: download capable 1 = yes, 0 = no
Time in milliseconds that the device will wait after receipt
of the DFU_DETACH request.
If this time elapses without a USB reset, the device will
terminate the Reconfiguration phase and revert back to
normal operation. This represents the maximum time that
the device can wait (depending on its timers, ...). The
Host may specify a shorter timeout in the DFU_DETACH
request.
Maximum number of bytes that the device can accept per
control-write transaction
4254C–MP3–03/06