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AT89C5132

4256A–USB–06/03

Table 6. DFU Mode Device Descriptor

DFU Configuration Descriptor This descriptor is identical to the standard configuration descriptor described in the USB

DFU specification version 1.0, with the exception that the bNumInterfaces field must

contain the value 01h.

DFU Interface Descriptor This is the descriptor for the only interface available when operating in DFU mode.

Therefore, the value of the bInterfaceNumber field is always zero.

Table 7. DFU mode Interface Descriptor

Offset Field Size Value Description

0 bLength 1 12h Size of this descriptor, in bytes

1 bDescriptorType 1 01h DFU FUNCTIONAL descriptor type

2 bcdUSB 2 0100h

USB specification release number in binary coded

decimal

4 bDeviceClass 1 FEh Application Specific Class Code

5 bDeviceSubClass 1 01h Device Firmware Upgrade Code

6 bDeviceProtocol 1 00h

The device does not use a class specific protocol on this

interface

7 bMaxPacketSize0 1 32 Maximum packet size for endpoint zero

8 idVendor 2 03EBh Vendor ID

10 idProduct 2 2FFFh Product ID

12 bcdDevice 2 0x0000 Device release number in binary coded decimal

14 iManufacturer 1 0 Index of string descriptor

15 iProduct 1 0 Index of string descriptor

16 iSerialNumber 1 0 Index of string descriptor

17 bNumConfigurations 1 01h One configuration only for DFU

Offset Field Size Value Description

0 bLength 1 09h Size of this descriptor, in bytes

1 bDescriptorType 1 04h INTERFACE descriptor type

2 bInterfaceNumber 1 00h Number of this interface

3 bAlternateSetting 1 00h Alternate setting

(1)

4 bNumEndpoints 1 00h Only the control pipe is used

5 bInterfaceClass 1 FEh Application Specific Class Code

6 bInterfaceSubClass 1 01h Device Firmware Upgrade Code

7 bInterfaceProtocol 1 00h

The device doesn’t use a class specific protocol

on this interface

8 iInterface 1 00h Index of the String descriptor for this interface

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 30 31

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