UPD72012 datasheet(12/36 Pages) NEC

12 / 36 page

Data Sheet S13918EJ3V0DS

µPD72012

2. DESCRIPTORS

Caution

For a Mask ROM code product, we release the software to make a data for Mask ROM option.

Please contact to Local NEC to get the software if you would like to make Mask ROM code

product.

2.1 Standard Device Descriptor

(1/2)

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 device

descriptor.

0x12

bDescriptorType

Shows that this is a standard device descriptor.

0x01

2bcdUSB

Shows that the

µPD72012 compliant with USB

Specifications Revision 1.1.

0x0110

bDeviceClass

HUB class code defined by USB

(HUB_CLASSCODE=“0x09”).

0x09

bDeviceSubClass

HUB subclass code defined by USB. Not defined in

HUB class.

0x00

bDeviceProtocol

Protocol code defined by USB. Not defined in HUB

class.

0x00

bMaxPacketSize0

Shows the maximum packet size in bytes of

endpoint 0 of the

µPD72012.

0x08

idVendor

Shows the vendor ID code registered in USB

standards.

For a standard ROM code product (003, 004), this is

“0x0409” (NEC vendor ID).

When using in a Mask ROM code product, set a

vendor ID for each manufacturer registered in USB

standards.

0x0409

0xXXXX

IdProduct

Shows the product ID code registered in USB

standards.

For a standard ROM code product (003, 004), this is

“0x55AB” (Generic_HUB).

In a Mask ROM code product, this value can be set

as you wish.

0x55AB

0xXXXX

bcdDevice

Shows the version number of the

µPD72012 using

decimal notation in XX.XX format.

For a standard ROM code product (003, 004), this is

“0x0200” (Ver. 2.0).

When using in a Mask ROM code product, manage

by varying the number for each ROM code.

0x0200

0xXXXX

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