14

4256B–USB–03/06

AT89C5132

restricted because it is anticipated that implementers will devise additional creative uses for

alternate settings.

DFU Functional

Descriptor

Command Description

This protocol allows to:

•

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

Overview of the protocol is detailed in Appendix-A.

Table 12. DFU Functional Descriptor

Offset

Field

Size

Value

Description

0

bLength

1

07h

Size of this descriptor, in bytes

1

bDescriptorType

1

21h

DFU FUNCTIONAL descriptor type

2

bmAttributes

1

Bit mask

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

3

wDetachTimeOut

2

Number

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.

5

wTransferSize

2

Number

Maximum number of bytes that the device can accept per

control-write transaction