AT89C5132-ROTIL datasheet(13/33 Pages) ATMEL

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4256B–USB–03/06

AT89C5132

Table 10. 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 11. DFU mode Interface Descriptor

Note:

1. Alternate settings can be used by an application to access additional memory segments. In

this case, it is suggested that each alternate setting employs a string descriptor to indicate the

target memory segment; e.g., “EEPROM”. Details concerning other possible uses of alternate

settings are beyond the scope of this document. However, their use is intentionally not

Offset

Field

Size

Value

Description

bLength

12h

Size of this descriptor, in bytes

bDescriptorType

01h

DFU FUNCTIONAL descriptor type

bcdUSB

0100h

USB specification release number in binary coded decimal

bDeviceClass

FEh

Application Specific Class Code

bDeviceSubClass

01h

Device Firmware Upgrade Code

bDeviceProtocol

00h

The device does not use a class specific protocol on this

interface

bMaxPacketSize0

Maximum packet size for endpoint zero

idVendor

03EBh

Vendor ID

idProduct

2FFFh

Product ID

bcdDevice

0x0000

Device release number in binary coded decimal

iManufacturer

Index of string descriptor

iProduct

Index of string descriptor

iSerialNumber

Index of string descriptor

bNumConfigurations

01h

One configuration only for DFU

Offset

Field

Size

Value

Description

bLength

09h

Size of this descriptor, in bytes

bDescriptorType

04h

INTERFACE descriptor type

bInterfaceNumber

00h

Number of this interface

bAlternateSetting

00h

Alternate setting (1)

bNumEndpoints

00h

Only the control pipe is used

bInterfaceClass

FEh

Application Specific Class Code

bInterfaceSubClass

01h

Device Firmware Upgrade Code

bInterfaceProtocol

00h

The device doesn’t use a class specific protocol on

this interface

iInterface

00h

Index of the String descriptor for this interface

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