UPD72012 datasheet(16/36 Pages) NEC

16 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

2.3 Standard Interface Descriptor

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

bLength

Shows the size in bytes of the standard interface

descriptor.

0x09

bDescriptorType

Shows that this is a standard interface descriptor.

0x04

bInterfaceNumber

If there are multiple interfaces, the host specifying

this value in a Set_Interface request selects this

interface.

This is “0x00” for the

µPD72012.

0x00

bAlternateSetting

This value is used if there is an alternate setting of

the interface. It is “0x00” for the

µPD72012.

0x00

bNumEndpoints

Shows the number of endpoints defined in this

interface.

0x01

bIntefaceClass

HUB class code defined by USB

(HUB_CLASSCODE=“0x09”).

0x09

bInterfaceSubClass

HUB subclass code defined by USB.

0x00

bInterfaceProtocol

Protocol code defined by USB. Not defined in HUB

class.

0x00

iInteface

Shows the index of the string descriptor for a

comment about the interface of a product using the

HUB.

Since not used for a standard ROM code product

(003, 004), its value is “0x00”.

When using this for a Mask ROM code product, set it

to “0x05”.

0x00

0x05

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